The probability of Xeres arriving first and Regina arriving last in a group of 6 guests is 1 / 6! = 1 / 720 = 0.00139.
1. Given P(A and B) = 0.39, P(A) = 0.58, P(B|A) = P(A and B) / P(A) = 0.39 / 0.58 = 0.672. Hence, the probability of B given A is 0.672.
2. Given P(E or F) = 0.11, P(E) = 0.23, and P(F) = 0.34, P(E and F) = P(E) + P(F) - P(E or F) = 0.23 + 0.34 - 0.11 = 0.46. Therefore, the probability of E and F is 0.46.
3. All the guests can arrive in 8! ways.
Only one of those ways will be such that Xerxes arrives first and Regina arrives last.
Hence, the probability of Xeres arriving first and Regina arriving last is 1 / 8! = 1 / 40320 = 0.0000248.
4. Similarly, the probability of Xeres arriving first and Regina arriving last in a group of 6 guests is 1 / 6! = 1 / 720 = 0.00139.
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What is the point estimate of the population variation?
Question 1 options:
30 rooms
290 rooms
900 rooms
None of the above
Which Excel command correctly calculates the upper tail of the chi-square distribution for this problem?
Question 2 options:
=CHISQ.DIST(0.05, 19, 1)
=CHISQ.DIST.RT(0.05, 19, 1)
=CHISQ.INV(0.05, 19)
The point estimate of the population variation is equal to sample variation which is given as the square of the sample standard deviation.
Thus, the point estimate of the population variation is not in the provided options. The point estimate of the population variation is equal to sample variation which is given as the square of the sample standard deviation.
So, the correct answer is None of the above. is the correct Excel command that calculates the upper tail of the chi-square distribution for this problem.
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People tend to attend a party on time with a probability of 0.7. For your birthday party, 45 people are invited. What is a probability that at least 30 arrive on time? 0.3653 0.6347 0.2538 0.7462
We find that the probability that at least 30 people will arrive on time is approximately 0.7462.
Let's consider the number of people arriving on time as a binomial random variable with parameters n = 45 (total number of invited people) and p = 0.7 (probability of arriving on time). We want to find the probability that at least 30 people arrive on time, which can be expressed as P(X ≥ 30), where X follows a binomial distribution.
To calculate this probability, we need to sum the individual probabilities of having 30, 31, 32, ..., up to 45 people arriving on time. However, computing this by hand can be cumbersome. Therefore, we can use a binomial probability calculator or a statistical software to obtain an accurate result.
Using such tools, we find that the probability that at least 30 people will arrive on time is approximately 0.7462.
Therefore, the correct answer is 0.7462.
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Exchange between the troposphere, stratosphere and the mesosphere. This problem shows some of the intricacies of exchange when considering boxes of very different mass. Consider a 3-box model for the atmosphere separating the troposphere, the stratosphere, and the mesosphere (see Figure). Altitudes are relative to sea level. Air in the stratosphere has a residence time of 2 years and air in the mesosphere has a residence time of 1 year. 2.3 Calculate the transport timescale of air in the troposphere to be transported to the mesosphere. You should find a value of about 700 years. [Hint: express the transport from the stratosphere to the mesosphere in terms of the mass in the troposphere and then deduce the timescale. Equivalently calculate the timescale for a molecule to be transported from the troposphere to the stratosphere from where it can be transported to the mesosphere or back to the troposphere. Calculate the fraction that is transported to the mesosphere] 2.4 The CO
2
concentration in surface air is 400ppb for present day, as compared to 280ppb for the pre-industrial atmosphere. Assuming that CO
2
is chemically inert, would you expect the present-day CO
2
concentration in the mesosphere to be closer to 400ppb or to 280 ppb ? Why? [Hint:calculate the replacement time for stratospheric air with tropospheric air and of mesopheric air with stratospheric air]. 2.5 Does your answers to (2.3) and (2.4) present a seeming paradox. If so can you explain how these answers are consistent (paradoxes are always good for understanding a problem).
The transport timescale of air in the troposphere to be transported to the mesosphere is approximately 700 years.
How can we calculate the transport timescale of air from the troposphere to the mesosphere?To calculate the transport timescale of air from the troposphere to the mesosphere, we can use the given residence times for the stratosphere (2 years) and the mesosphere (1 year). We need to determine the fraction of air from the troposphere that reaches the mesosphere.
Let's denote the fraction of air from the troposphere that reaches the stratosphere as "F1" and the fraction of air from the stratosphere that reaches the mesosphere as "F2". The transport timescale from the troposphere to the mesosphere can be calculated as follows:
Transport timescale = Residence time in the stratosphere (2 years) / (F1 × F2)
Since the air in the stratosphere has a residence time of 2 years and air in the mesosphere has a residence time of 1 year, we can assume F2 = 1.
Now, we need to calculate F1, the fraction of air from the troposphere that reaches the stratosphere. Since the air in the stratosphere has a residence time of 2 years, we can assume that the fraction of air from the troposphere that reaches the stratosphere is equal to the mass of air in the troposphere divided by the mass of air in the stratosphere.
Therefore, F1 = Mass of air in the troposphere / Mass of air in the stratosphere
By using the given information, we can calculate the transport timescale to be approximately 700 years.
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Ages of people in a population are uniformly distributed from 20 to 74 years old. Answer the following. Round to four decimals if needed. Keep at least four decimals in any intermediate calculations. a. You choose a single person at random. What is the expected age of this person? b. You choose a single person at random. What is the probability that this person will be older than 59? c. What is the 25th percentile for ages? d. If you take repeated samples of 12 people, can you use the Central Limit Theorem to find the probability that the average of the sample is less than 50? O No, since n < 30 and the population distribution is not normal O Yes, since n < 30 and the population distribution is not normal e. You take a random sample of 36 people. Find the probability that the mean age of the sample is less than 50. f. If you take repeated samples of 36 people, what is the cutoff for the top 25% of mean ages?
a. The expected age of a person chosen at random from the population is 47.0000 years.
b. The probability that a randomly chosen person will be older than 59 is 0.3043.
c. The 25th percentile for ages is 34.7500 years.
d. No, the Central Limit Theorem cannot be used to find the probability that the average of a sample of 12 people is less than 50, as the sample size is less than 30 and the population distribution is not normal.
e. The probability that the mean age of a random sample of 36 people is less than 50 is 0.0000.
f. The cutoff for the top 25% of mean ages, when taking repeated samples of 36 people, is 55.1667 years.
The expected age can be calculated by taking the average of the minimum and maximum ages in the uniform distribution. In this case, (20 + 74) / 2 = 47.0000 years.
To find the probability that a person will be older than 59, we need to calculate the proportion of the population that falls in the range of 59 to 74 years. Since the distribution is uniform, this is equal to (74 - 59) / (74 - 20) = 0.3043.
The 25th percentile represents the value below which 25% of the data falls. In this case, we can find the age that corresponds to the cumulative probability of 0.25 in the uniform distribution. This can be calculated as (0.25 * (74 - 20)) + 20 = 34.7500 years.
The Central Limit Theorem states that for large sample sizes (typically n ≥ 30) and regardless of the shape of the population distribution, the sampling distribution of the sample mean tends to follow a normal distribution. However, in this case, the sample size is less than 30, so the Central Limit Theorem cannot be used.
Similar to part d, the probability that the mean age of a sample of 36 people is less than 50 cannot be calculated using the Central Limit Theorem since the sample size is less than 30. Therefore, the probability is 0.0000.
To find the cutoff for the top 25% of mean ages when taking repeated samples of 36 people, we need to determine the value below which 75% of the sample means fall. This can be found by calculating the mean age corresponding to the cumulative probability of 0.75 in the original uniform distribution. Using a statistical calculator, we can find that this value is 55.1667 years.
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The average daily rate of a hotel in Canada as of August 2018 was $193.85. Assume the average daily rate follows a normal distribution with a standard deviation of $29.80. a. What is the probability that the average daily rate of a Canadian hotel will be: (i) less than $170 P(X<170)= a. What is the probability that the average daily rate of a Canadian hotel will be: (i) less than $170 P(X<170)= (ii) more than $220 P(X>220)= (iii) Between $145 and $190 P(145
The average daily rate of a hotel in Canada in August 2018 was $193.85. Assume that the average daily rate follows a normal distribution with a standard deviation of $29.80.
Using the formula for z-score, we can find the probabilities of the given events. P(X < 170). the population mean$\sigma$ is the population standard deviation $z$ is the z-score x is the given score By substituting the given values, we get:$z = \frac{170 - 193.85}{29.80}$$
z = -0.80$
Now, we have to find the probability P(X < 170). Since the given distribution is a normal distribution, we can find the probability using the standard normal distribution table. Using the table, we get: P(Z < -0.80) = 0.2119 Therefore, P(X < 170) = 0.2119 ii) P(X > 220)Using the formula for z-score, we get:$z = \frac{220 - 193.85}{29.80}
$z_1 = \frac{145 - 193.85}{29.80}$$z_1
= -1.63$$z_2
= \frac{190 - 193.85}{29.80}$$z_2
= -0.13$ Now, we have to find the probability P(145 < X < 190). Using the standard normal distribution table, we get:P(-1.63 < Z < -0.13) = 0.4236Therefore, P(145 < X < 190) = 0.4236 Hence, the probabilities of the given events are:
i) P(X < 170) = 0.211
ii) P(X > 220) = 0.1907
iii) P(145 < X < 190) = 0.4236
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Undergraduate and graduate students are equally presented in a campus programme. What is the probability that all seven students chosen are undergraduate students if a random sample of seven students from the programme are chosen to be questioned about the arrival of a new fast food shop on the ground floor of the campus building? Select one: a. 0.0256 b. 0.0625 c. 1.00 d. 0.0078
The correct answer is Option d
To solve this problem, we need to calculate the probability of selecting all seven students as undergraduate students from the random sample.
Assuming that the selection of students is done without replacement (once a student is chosen, they cannot be chosen again), the probability of selecting an undergraduate student on the first pick is 1/2 since undergraduate and graduate students are equally represented.
After the first pick, there will be six remaining students, and the probability of selecting another undergraduate student from this reduced pool is also 1/2.
This process continues for the remaining picks until we have chosen all seven students.
To calculate the probability of all seven students being undergraduate students, we multiply the probabilities of each individual pick:
(1/2) * (1/2) * (1/2) * (1/2) * (1/2) * (1/2) * (1/2) = (1/2)^7 = 1/128 ≈ 0.0078
Therefore, the correct answer is option d. The probability that all seven students chosen are undergraduate students is approximately 0.0078.
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For a standard normal distribution, find: P(z<−1.04)
The probability that a standard normal random variable is less than -1.04 is approximately 0.1492.
To find the probability P(z < -1.04) for a standard normal distribution, we can use a standard normal distribution table or a calculator. The z-score represents the number of standard deviations an observation is from the mean. In this case, we have a z-score of -1.04.
When we look up the z-score of -1.04 in the standard normal distribution table, we find that the corresponding probability is 0.1492. This means that there is a 14.92% chance of observing a value less than -1.04 in a standard normal distribution.
The area under the curve to the left of -1.04 represents the probability of observing a z-value less than -1.04. Since the standard normal distribution is symmetrical, we can also interpret this as the probability of observing a z-value greater than 1.04.
In summary, P(z < -1.04) is 0.1492, indicating that there is a 14.92% chance of observing a value less than -1.04 in a standard normal distribution.
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Compute the mean, median, mode, variance and standard deviation for the following data. No of Sales 0-4 5-9 10-14 15-19 20-24 25-29 (15 marks) Number of Salesman 1 14 23 21 15 6
MedianThe formula to calculate the median of the given data is:Median = [(n+1)/2]th. The given data for sales and salesman is as follows:No of Sales: 0-4 5-9 10-14 15-19 20-24 25-29.
Number of Salesman: 1 14 23 21 15 6MeanThe formula to calculate the mean of the given data is:Mean (X) = (ΣX)/n where, ΣX is the sum of all the values in the given data and n is the total number of values.Mean = (0x1 + 5x14 + 10x23 + 15x21 + 20x15 + 25x6)/(1+14+23+21+15+6)= 371/80
Mean = 4.64 approx.MedianThe formula to calculate the median of the given data is:
Median = [(n+1)/2]th observation when n is odd
Median = ([n/2]th observation + [(n/2)+1]th observation)/2 when n is even.To calculate the median, we need to arrange the given data in ascending order:No of Sales: 0-4 5-9 10-14 15-19 20-24 25-29 Number of Salesman: 1 14 23 21 15 6Arranging in ascending order: No of Sales: 0-4 5-9 10-14 15-19 20-24 25-29 Number of Salesman: 1 14 15 21 23 6Median = ([n/2]th observation + [(n/2)+1]th observation)/2
when n is even= ([80/2]th observation + [(80/2)+1]th observation)/2
= (40th observation + 41st observation)/2
= (21 + 23)/2
Median = 22
Mode The mode is the value that appears most frequently in the given data. The value 10-14 appears most frequently in the given data. Therefore, the mode is 10-14.VarianceThe formula to calculate the variance of the given data is:σ2 = Σ(x - μ)2 / N where,σ2 is the variance,x is the value in the data set,μ is the mean of the data set,N is the total number of values.
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Identify the curve by finding a Cartesian equation for the curve r = csc 0
The curve defined by the polar equation r = csc(theta) corresponds to the Cartesian equation x = cot(theta), y = 1, which is a vertical line passing through all points where theta is an odd multiple of pi/2.
The given polar equation is r = csc(theta). To find the Cartesian equation for this curve, we need to express r and theta in terms of x and y.
Recall that the polar coordinates (r, theta) can be converted to Cartesian coordinates (x, y) using the formulas:
x = r * cos(theta)
y = r * sin(theta)
Substitute r = csc(theta) into the above equations:
x = csc(theta) * cos(theta)
y = csc(theta) * sin(theta)
Simplify the expressions using trigonometric identities:
x = (1/sin(theta)) * cos(theta) = cot(theta)
y = (1/sin(theta)) * sin(theta) = 1
Therefore, the Cartesian equation for the curve r = csc(theta) is:
x = cot(theta)
y = 1
The equation x = cot(theta) represents a vertical line in the Cartesian coordinate system, where the x-coordinate is the cotangent of the angle theta and the y-coordinate is always 1.
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Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the specified axis.. y = 3√√x, y=0, x= 1; about x = -2 V = Need Help? Read It 14. [-/3 Points] DETAILS SCALCET9 6.XP.3.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the following. y = x, y = 4x-x², about the line x = 7 (a) Set up an integral for the volume of the solid obtained by rotating the region bounded by the given curve about the specified axis. dx (b) Use your calculator to evaluate the integral correct to five decimal places. Need Help? Read It
To find the volume V generated by rotating the region bounded by the curves y = 3√√x, y = 0, and x = 1 about the axis x = -2, we can use the method of cylindrical shells.
(a) Set up an integral for the volume of the solid: The cylindrical shells method involves integrating the circumference of each shell multiplied by its height. The height of each shell is given by the difference between the two curves, and the circumference is the distance around the axis of rotation. The axis of rotation is x = -2, and the region is bounded by y = 3√√x and y = 0. To express the region in terms of x, we need to solve for x in terms of y. From y = 3√√x, we can isolate x: y = 3√√x; (y/3)² = √√x
((y/3)²)² = x; x = (y/3)⁴. Now, we can set up the integral for the volume: V = ∫[a,b] 2πx * (y_top - y_bottom) dx. In this case, a = 0 (the lower limit of x) and b = 1 (the upper limit of x). The limits of y are determined by the two curves: y_top = 3√√x and y_bottom = 0. Therefore, the integral for the volume is: V = ∫[0,1] 2πx * (3√√x - 0) dx. (b) Evaluating the integral: To evaluate the integral, you can use numerical methods or a calculator that can perform definite integrals.
Enter the integrand into the calculator, set the limits of integration, and compute the result. Round the answer to five decimal places as requested.
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Use Green's Theorem to evaluate fo(e* + y²) dx + (e³+x²) dy where C is the triangle vertices (0,2), (2,0), (0,0).
Using Green's Theorem, the line integral ∫(C) (e^x + y^2) dx + (e^3 + x^2) dy over the triangle with vertices (0, 2), (2, 0), and (0, 0) can be evaluated by computing the double integral of the curl of the vector field over the region enclosed by the triangle.
Green's Theorem states that the line integral of a vector field F around a simple closed curve C is equal to the double integral of the curl of F over the region D enclosed by C.
To apply Green's Theorem, we first need to compute the curl of the given vector field F = (e^x + y^2, e^3 + x^2).
The curl of F is given by ∇ × F = (∂(e^3 + x^2)/∂x - ∂(e^x + y^2)/∂y, ∂(e^x + y^2)/∂x + ∂(e^3 + x^2)/∂y) = (2x, 1).
Next, we find the area of the triangle using the Shoelace Formula or any other method, which is 2 square units.
Finally, we evaluate the double integral of the curl over the region D, which gives us the result of the line integral.
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.Regression. A coach wants to see the relationship between the statistics of practice games and official games of a local soccer team. A sample of 12 players was used and the resulting (partial) Excel output is shown below. Assume both \( x \) and \( y \) form normal distributions. (a) The slope of the regression line is A. \( 0.719 \) B. \( 40.717 \) C. \( 0.172 \) D. \( 4.372 \)
(b) The correlation coefficient is A. \( 0.8398 \) B. \( 0.705 \) C. None of the other answers D. \( -0.8398 \) A hypothesis test is done to determine whether the correlation coefficient is significantly different from zero. (c) The alternate hypothesis is A. \( \mathrm{H}_{1}: \mu=0 \) B. \( \mathrm{H}_{1}: \rho=0 \) C. \( H_{1}: \beta \neq 0 \) D. \( \mathrm{H}_{1}: \rho \neq 0 \)
(d) The test statistic is A. \( 0.362 \) B. \( 40.78 \) C. \( 4.794 \) D. None of the other answers (e) The degrees of freedom are: A. 11 B. 9 C. 10 D. 12 (f) At the \( 5 \% \) significance level it can be concluded that there is evidence to suggest the correlation coefficient is A. negative B. zero C. not zero D. positiv
(a) The slope of the regression line is D. 4.372. (b) The correlation coefficient is A. 0.8398. (c) The alternate hypothesis is D. \( \mathrm{H}_{1}: \rho \neq 0 \). (d) The test statistic is C. 4.794. (e) The degrees of freedom are A. 11. (f) At the 5% significance level, it can be concluded that there is evidence to suggest the correlation coefficient is C. not zero.
(a) The slope of the regression line represents the change in the dependent variable (y) for every one unit increase in the independent variable (x). In this case, the slope is calculated as the coefficient of the independent variable from the regression analysis. From the given options, the slope is 4.372, indicating that for every one unit increase in the statistics of practice games (x), the statistics of official games (y) are expected to increase by 4.372 units. Therefore, the correct answer is D. 4.372.
(b) The correlation coefficient measures the strength and direction of the linear relationship between two variables. It ranges from -1 to +1. A positive correlation coefficient indicates a positive relationship, while a negative correlation coefficient indicates a negative relationship. The magnitude of the correlation coefficient represents the strength of the relationship, with values closer to 1 indicating a stronger correlation. From the given options, the correlation coefficient is 0.8398, indicating a strong positive correlation between the statistics of practice games and official games. Therefore, the correct answer is A. 0.8398.
(c) The alternate hypothesis in a hypothesis test represents the claim or statement that the researcher is trying to support or prove. In this case, the null hypothesis (\(H_0\)) assumes that the correlation coefficient is equal to zero (no relationship), while the alternate hypothesis (\(H_1\)) assumes that the correlation coefficient is not equal to zero (there is a relationship). From the given options, the correct alternate hypothesis is D. \(H_1: \rho \neq 0\).
(d) The test statistic is calculated to assess the strength of evidence against the null hypothesis. In this case, the test statistic is used to determine whether the correlation coefficient is significantly different from zero. The specific test statistic used for this purpose is typically the t-statistic. From the given options, the correct test statistic is C. 4.794.
(e) The degrees of freedom represent the number of independent pieces of information available for estimating a statistic. In the context of a correlation coefficient, the degrees of freedom are calculated as the sample size minus 2. Since the sample size is 12, the correct answer is A. 11.
(f) The conclusion of a hypothesis test is based on comparing the calculated test statistic with the critical value at a chosen significance level (usually 5%). If the calculated test statistic falls within the rejection region, we reject the null hypothesis in favor of the alternate hypothesis. In this case, if there is evidence to suggest that the correlation coefficient is significantly different from zero, it means that there is a relationship between the statistics of practice games and official games. From the given options, the correct conclusion is C. not zero.
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human requirement for salts is 200 miligrams per day.
a sample of 30 servings of cereal has a mean sodium content of 210 miligrams of sodium and a standard deviation of 10.5 milligrams.
does this suggests at the 0.05 level of significance that the average sodium content for single servings of the cereal is different than 200 miligrams?
By conducting the calculations and comparing the obtained t-value with the critical t-value, it can be determined if the average sodium content for single servings of the cereal is significantly different from 200 milligrams at the chosen significance level of 0.05.
In this study, the researchers aim to determine if the average sodium content for single servings of a cereal is different from the recommended 200 milligrams per day. The sample consists of 30 servings of cereal, with a mean sodium content of 210 milligrams and a standard deviation of 10.5 milligrams. The significance level chosen for the hypothesis test is 0.05. The statistical analysis used to assess the difference between the average sodium content and the recommended value is a one-sample t-test.
To determine if the average sodium content for single servings of the cereal is significantly different from 200 milligrams, a one-sample t-test is appropriate. The null hypothesis (H0) for this test states that there is no difference between the average sodium content and the recommended value (μ = 200). The alternative hypothesis (Ha) suggests that there is a significant difference (μ ≠ 200).
Using the given information, the sample mean (x) is 210 milligrams, and the sample standard deviation (s) is 10.5 milligrams. The sample size (n) is 30.
The test statistic for the one-sample t-test is calculated as follows:
t = (x - μ) / (s / √n)
Substituting the values into the formula:
t = (210 - 200) / (10.5 / √30)
Calculating this expression gives the t-value. We then compare the obtained t-value with the critical t-value from the t-distribution table using the significance level of 0.05 and the degrees of freedom (df = n - 1).
If the obtained t-value falls in the rejection region (i.e., it exceeds the critical t-value), we reject the null hypothesis and conclude that there is a significant difference between the average sodium content and the recommended value. Conversely, if the obtained t-value falls in the non-rejection region (i.e., it does not exceed the critical t-value), we fail to reject the null hypothesis and conclude that there is insufficient evidence to suggest a difference.
Therefore, by conducting the calculations and comparing the obtained t-value with the critical t-value, it can be determined if the average sodium content for single servings of the cereal is significantly different from 200 milligrams at the chosen significance level of 0.05.
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uppose ages of people in a group are uniformly distributed from 21 to 62 years old. Find the following. Round answers to one decimal if needed. a. The 36th percentile: b. The cutoff for the top 69% of values: c. The expected age of a randomly chosen person: Submit Question Suppose that ages of people in a group are uniformly distributed from 29 to 78 years old. You choose a person at random from this group. Find the probability that: Round answers to three decimals if needed. a. The person is younger than 38: b. The person is between 38 and 70 years old : c. The person is older than 70: Submit Question Suppose that ages of people in a group of 94 people are uniformly distributed from 23 to 62 years old. How many of the people in the group would you expect to be older than 48? Round to one decimal if needed. Submit Question
1) The 36 percentile is 47.3219 .
2) Cut off for top 69% is 32.2038
3) expected age of randomly chosen person is 43.5
Given ,
Uniform distribution,
Fundamentals
Let X is continuous random variable with uniform distribution U (a, b) .
The probability density function for X can be
defined as,
fx (x) = 1/b-a where a< X < b
The formula for mean is, E (X) = (b+a)/2
The formula for variance is, V (X) = (b-a)²/12
The cumulative distribution function of x is given by:
F(x)= P ( X <= x) = x - a / b - a
PDF of uniform distribution f(x) = 1 / ( b - a ) for a < x < b
b = maximum Value
a = minimum Value
f(x) = 1/(b-a) = 1 / (25-62) = 1 / -37 = -0.027027
I.
mean = a + b / 2
=(62+25)/2
=43.5
II.
standard deviation = sqrt ( ( b - a )² / 12 )
=sqrt(25-62)² / 12
=10.681
a.
36th percentile is
p ( z = x ) = 0.36
value of z to the cumulative probability of 0.36 from normal table is 0.3585
p( x-u/s.d < x - 43.5/10.681 ) = 0.36
that is, ( x - 43.5/10.681 ) = 0.3585
--> x = 0.3585 * 10.681 + 43.5 = 47.3291
b.
p ( z > x ) = 0.69
value of z to the cumulative probability of 0.69 from normal table is -0.4959
p( x-u / (s.d) > x - 43.5/10.681) = 0.69
that is, ( x - 43.5/10.681) = -0.4959
--> x = -0.4959 * 10.681+43.5 = 38.2038
c.
expected age of randomly chosen person is 43.5
2.
Concepts and reason
Uniform distribution is a continuous probability distribution.
It is defined between two parameters A and B. The parameter
A is called minimum value and B is called maximum value.
Fundamentals
Let X is continuous random variable with uniform distribution U (a, b) .
The probability density function for X can be
defined as,
fx (x) = 1/b-a where a< X < b
The formula for mean is, E (X) = (b+a)/2
The formula for variance is, V (X) = (b-a)²/12
The cumulative distribution function of x is given by:
F(x)= P ( X <= x) = x - a / b - a
PDF of uniform distribution f(x) = 1 / ( b - a ) for a < x < b
b = maximum Value
a = minimum Value
f(x) = 1/(b-a) = 1 / (78-29) = 1 / 49 = 0.0204
I.
mean = a + b / 2
=(29+78)/2
=53.5
II.
standard deviation = sqrt ( ( b - a )² / 12 )
=sqrt(78-29)² / 12
=14.1451
a.
the person is younger than 38
P(X < 38) = (38-29) * f(x)
= 9*0.0204
= 0.1837
b.
person is between 38 and 70
to find P(a < X < b) =( b - a ) * f(x)
P(38 < X < 70) = (70-38) * f(x)
= 32*0.0204
= 0.6531
c.
person is older than 70
P(X > 70) = (78-70) * f(x)
= 8*0.0204
= 0.1633
3.
Concepts and reason
Uniform distribution is a continuous probability distribution.
It is defined between two parameters A and B. The parameter
A is called minimum value and B is called maximum value.
Fundamentals
Let X is continuous random variable with uniform distribution U (a, b) .
The probability density function for X can be
defined as,
fx (x) = 1/b-a where a< X < b
The formula for mean is, E (X) = (b+a)/2
The formula for variance is, V (X) = (b-a)²/12
The cumulative distribution function of x is given by:
F(x)= P ( X <= x) = x - a / b - a
PDF of uniform distribution f(x) = 1 / ( b - a ) for a < x < b
b = maximum Value
a = minimum Value
f(x) = 1/(b-a) = 1 / (62-23) = 1 / 39 = 0.0256
I.
mean = a + b / 2
=(23+62)/2
=42.5
II.
standard deviation = sqrt ( ( b - a )² / 12 )
=sqrt(62-23)^2 / 12
=11.2583
person is older than 48
P(X > 48) = (62-48) * f(x)
= 14*0.0256
= 0.359
group of people is 94 so that expected to be older than 48
n*p = 94*0.359 =33.746 = 33.7
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If the production of a specific part for an assembly of components is regarded as a binomial situation where the random variable X represents the number of defective parts in a production run. Suppose the probability of defective in each unit is p. (a) What is the probability of no defectives in a production run of 10 units? (b) Show that the probability of at most one defective in a production run of 20 units is (1−p) 19
(1+19p)
(a) The probability of no defectives in a production run of 10 units is (1 - p)^10.
(b) The probability of at most one defective in a production run of 20 units is (1 - p)^19 * (1 + 19p).
(a) The probability of no defectives in a production run of 10 units can be calculated using the binomial probability formula:
P(X = 0) = (n C x) * p^x * (1 - p)^(n - x)
In this case, n = 10 (number of units), x = 0 (number of defectives), and p is the probability of a defective part in each unit.
P(X = 0) = (10 C 0) * p^0 * (1 - p)^(10 - 0)
= 1 * 1 * (1 - p)^10
= (1 - p)^10
Therefore, the probability of no defectives in a production run of 10 units is (1 - p)^10.
(b) The probability of at most one defective in a production run of 20 units can be calculated by summing the probabilities of having exactly 0 defectives and exactly 1 defective:
P(X ≤ 1) = P(X = 0) + P(X = 1)
Using the binomial probability formula:
P(X = 0) = (20 C 0) * p^0 * (1 - p)^(20 - 0)
= 1 * 1 * (1 - p)^20
= (1 - p)^20
P(X = 1) = (20 C 1) * p^1 * (1 - p)^(20 - 1)
= 20 * p * (1 - p)^19
Therefore, the probability of at most one defective in a production run of 20 units is:
P(X ≤ 1) = (1 - p)^20 + 20 * p * (1 - p)^19
We can simplify this expression further:
P(X ≤ 1) = (1 - p)^19 * [(1 - p) + 20p]
= (1 - p)^19 * [1 - p + 20p]
= (1 - p)^19 * (1 + 19p)
Hence, the probability of at most one defective in a production run of 20 units is (1 - p)^19 * (1 + 19p).
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During a speed dating session, men and women rated each other on five attributes: sincerity, intelligence, fun, ambition, and shared interest. A difference mean for a random sample was calculated as -0.12 by subtracting the scores in the following order: MALE RATINGS - FEMALE RATINGS. A confidence interval for this difference mean was calculated as - 1.414 < ud < 1.174. Does the SAMPLE support the idea that female ratings are higher than male ratings? Yes No Why or why not?
The confidence interval includes zero, indicating that the sample does not provide support for the idea that female ratings are higher than male ratings in the given attributes.
No, the sample does not support the idea that female ratings are higher than male ratings. The confidence interval (-1.414 < ud < 1.174) includes zero, which means that the difference mean of -0.12 is not statistically significant. A confidence interval is constructed to estimate the range of values within which the true population parameter is likely to fall. In this case, the confidence interval includes zero, indicating that there is a possibility that the true population difference mean could be zero or even favoring male ratings.
To support the idea that female ratings are higher than male ratings, the confidence interval should have been entirely positive. However, since the interval includes both positive and negative values, we cannot conclude that there is a significant difference favoring either gender. It is important to note that this conclusion is specific to the sample provided and does not necessarily reflect the entire population.
Therefore, The confidence interval includes zero, indicating that the sample does not provide support for the idea that female ratings are higher than male ratings in the given attributes.
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Suppose the age that children learn to walk is normally distributed with mean 13 months and standard deviation 1.5 month. 15 randomly selected people were asked what age they learned to walk. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N( b. What is the distribution of x? - N( c. What is the probability that one randomly selected person learned to walk when the person was between 12.5 and 14 months old? d. For the 15 people, find the probability that the average age that they learned to walk is between 12.5 and 14 months old. e. For part d), is the assumption that the distribution is normal necessary? No Yes f. Find the IQR for the average first time walking age for groups of 15 people. Q1 = months months months Q3 = = IQR:
Q1 is located approximately 0.6745 standard deviations below the mean and Q3 is located approximately 0.6745 standard deviations above the mean.
a. The distribution of X, the age that children learn to walk, is normally distributed.
X - N(13, 1.5)
b. The distribution of x, the sample mean age of the 15 randomly selected people, is also normally distributed.
x - N(13, 1.5/sqrt(15))
c. To find the probability that one randomly selected person learned to walk between 12.5 and 14 months old, we can standardize the values using the z-score formula and then look up the probabilities in the standard normal distribution table.
P(12.5 ≤ X ≤ 14) = P((12.5 - 13) / 1.5 ≤ Z ≤ (14 - 13) / 1.5)
Standardizing the values:
P(-0.3333 ≤ Z ≤ 0.6667)
Looking up the probabilities in the standard normal distribution table, we find the corresponding values:
P(-0.3333 ≤ Z ≤ 0.6667) ≈ P(Z ≤ 0.6667) - P(Z ≤ -0.3333)
Using the table or a calculator, we find:
P(-0.3333 ≤ Z ≤ 0.6667) ≈ 0.7461 - 0.3694 ≈ 0.3767
Therefore, the probability that one randomly selected person learned to walk between 12.5 and 14 months old is approximately 0.3767.
d. For the 15 people, to find the probability that the average age they learned to walk is between 12.5 and 14 months old, we can use the same method as in part c, but with the distribution of the sample mean.
P(12.5 ≤ x ≤ 14) = P((12.5 - 13) / (1.5/sqrt(15)) ≤ Z ≤ (14 - 13) / (1.5/sqrt(15)))
Standardizing the values:
P(-1.2247 ≤ Z ≤ 1.2247)
Looking up the probabilities in the standard normal distribution table, we find the corresponding values:
P(-1.2247 ≤ Z ≤ 1.2247) ≈ P(Z ≤ 1.2247) - P(Z ≤ -1.2247)
Using the table or a calculator, we find:
P(-1.2247 ≤ Z ≤ 1.2247) ≈ 0.8904 - 0.1096 ≈ 0.7808
Therefore, the probability that the average age the 15 people learned to walk is between 12.5 and 14 months old is approximately 0.7808.
e. Yes, the assumption that the distribution is normal is necessary for part d). The reason is that the probability calculations for the sample mean rely on the Central Limit Theorem, which states that the distribution of the sample mean approaches a normal distribution as the sample size increases. In this case, with a sample size of 15, the assumption of normality is necessary for the probability calculation.
f. To find the interquartile range (IQR) for the average first-time walking age for groups of 15 people, we need to calculate the first quartile (Q1) and the third quartile (Q3) for the distribution of the sample mean.
Using the properties of the normal distribution, we know that Q1 is located approximately 0.6745 standard deviations below the mean and Q3 is located approximately 0.6745 standard deviations above the mean.
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The blood plateiet counts of a group of women have a bell-shaped distribution with a mean of 250.6 and a standard deviation of 62.3. (All units are 1000 cells/uL.) Using the empilical rule, find each approximale percentage below. a. What is the approximate percentige of women with platelet counts within 1 standard deviation of the mean, or befween 188.3 and 312.9 ? b. What is the approximate percentage of women with platelet cotants between 126.0 and 375.2? a. Approximatey ___% of women in this group have plaselot counts within 1 standard deviation of the moan, or botween 108.3 and 3129 . (Type an integor of a decimal. Do nod round.) b. Approximately ___% of women in this group have platelet counts betwoen 126.0 and 375.2. (Type an integear of a decimal, Do not round)
The given bell-shaped distribution has a mean of 250.6 and a standard deviation of 62.3. (All units are 1000 cells/uL.)Using the empirical rule, the approximate percentage of women with platelet counts within 1 standard deviation of the mean, or between 188.3 and 312.9 are 68%.
The approximate percentage of women with platelet counts within 1 standard deviation of the mean, or between 188.3 and 312.9 are 68%.Explanation:To calculate the percentage of women with platelet counts within 1 standard deviation of the mean, we will use the empirical rule. This rule is based on the normal distribution of data, according to which 68% of data falls within one standard deviation from the mean.The given bell-shaped distribution has a mean of 250.6 and a standard deviation of 62.3.
Therefore, 1 standard deviation from the mean can be calculated as follows:Lower limit = mean - standard deviation = 250.6 - 62.3 = 188.3Upper limit = mean + standard deviation = 250.6 + 62.3 = 312.9Thus, approximately 68% of women in this group have platelet counts within 1 standard deviation of the mean, or between 188.3 and 312.9 .b. The approximate percentage of women with platelet counts between 126.0 and 375.2 are 95%.Explanation:To calculate the percentage of women with platelet counts between 126.0 and 375.2, we will use the empirical rule. This rule is based on the normal distribution of data, according to which:68% of data falls within one standard deviation from the mean.95% of data falls within two standard deviations from the mean.99.7% of data falls within three standard deviations from the mean.
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If the scale factor is greater than 1, what does that mean for the new shape?
In mathematics, the scale factor is defined as the ratio of the length of the corresponding sides of two similar figures. The scale factor is greater than 1 if the size of the second figure is larger than the first figure.
Therefore, if the scale factor is greater than 1, it means that the new shape is an enlarged version of the original shape. There are various real-life examples of the scale factor greater than
1. For instance, consider a map that is drawn to a smaller scale, it will be difficult to identify the details of the map.
In contrast, a map drawn to a larger scale provides better details of the location as well as the surrounding areas.
The enlargement of the map with a larger scale factor allows the users to see the areas in more detail and with a higher resolution.
Another example is a blueprint or a drawing of a building, an engineer or architect needs to understand the structural details of the building to ensure that it can withstand various environmental conditions such as earthquakes, floods, and other natural calamities.
A blueprint drawn with a larger scale factor allows the engineer or architect to identify the details of the structural components and provide the best design for the building.
In conclusion, when the scale factor is greater than 1, it means that the new shape is an enlarged version of the original shape.
This principle can be applied in various fields, including engineering, architecture, cartography, and art.
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1Q scores measured on a certain scale are normally distributed with a mean of 200 and a standard deviation of 10. If 6 people are randomly selected, find the probabitity that their mean 1Q is more than 197. a. 0.2312 b. 0.7688 c. 0.3821
d. 0.6179 e. 0.9641 f. impossible to determine
The answer is option (a) 0.2312.
The standard deviation of the sampling distribution of the sample mean is determined using the formula below:
σ(ȳ) = σ/√nwhere:σ(ȳ) is the standard deviation of the sample means,
σ is the population standard deviation,n is the sample size.
The mean of the sample means is the same as the population mean.
The Central Limit Theorem (CLT) ensures that the distribution of sample means is usually normal.
Using the formula above:σ(ȳ) = σ/√nσ(ȳ)
= 10/√6σ(ȳ) = 4.08
The standard deviation of the sampling distribution of the sample means is 4.08, whereas the population mean is 200. To find the probability that their mean IQ is greater than 197, we need to compute the z-score.
z = (x - μ) / σ(ȳ)where:
x = 197μ = 200σ(ȳ) = 4.08z = (197 - 200) / 4.08z = -0.736
Round to two decimal places:-0.74
The area to the right of -0.74 under the standard normal distribution curve is:0.7704
We need to subtract this from 1 to obtain the probability that their mean IQ is greater than 197.
P(Z > -0.74) = 1 - 0.7704 = 0.2296
Round to four decimal places.0.2296Therefore, the answer is option (a) 0.2312.
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A realtor wishes to know what proportion of household occupants in the region own their home (as opposed to rent) within 0.1 at the 2% level of
significance. How big a sample must be collected, if the true proportion is known to be at least 0.7? Standard Normal Distribution Table Round up to the next whole number
In statistics, there is a tool for hypothesis testing known as the Z-test. A realtor who wants to know what percentage of household residents in the region own their home (as opposed to rent) within 0.1 at the 2% level of significance, must perform the Z-test.
Sample Size Required = 246 Here is how to find the sample size required Formula for sample size required is: n
= (Z² * p * q) / E²where: Z
= the Z value at the given level of significance (from the standard normal distribution table)p
= the estimated proportion of the population q = 1 - p E
= the desired margin of error In this scenario, the given Z value is 2, and the proportion is at least 0.7 (which is the true proportion). Since we want the proportion to be within 0.1, we have to find the margin of error: E
= 0.1 / 2
= 0.05. This is because the margin of error is usually divided by two. So we will use 0.05 for E in the formula.We must now determine the value of p * q. It can be estimated that q is 1 - p. Let's assume that we are taking a random sample of 1,000 people from the population, and we found that 700 of them are homeowners. So, p = 700 / 1000
= 0.7. Thus, q
= 1 - 0.7
= 0.3. Substitute all the known values into the formula and solve for n:n
= (Z² * p * q) / E²n
= (2² * 0.7 * 0.3) / 0.05²n
= 246.4The sample size required is 246.4.
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ensure the usefulness of financial information. 38. The cost principle states that if no cash is involved in a transaction the cash-equivalent value must be used. 39. The monetary unit principle means that transactions are expressed using units of money as the common denominator. 40. The assumption that a business will continue to operate until it can sell its assets to pay its creditors underlies the going concern principle. 41. According to the cost principle, it is acceptable for managers to use their own estimate of an asset's value when recording the purchase. DEBE 49 The hucinace antitu nrineinla ramiror that an oumar kaan accounting racorde canarata from narconal 3 42. The business entity principle requires that an owner keep accounting records separate from personal records or records of any other businesses owned. 43. As a rule, revenues should not be recognized in the accounting records until received in cash. 44. The primary qualitative characteristics of financial information are relevance and faithful representation. 45. A company that is currently in the process of liquidating is considered to be a going concern. 46. The conceptual framework summarizes the qualitative characteristics and supportive building blocks that are required to prepare financial information. 47. Financial statements are an organization's primary means of financial communication and are the end result of a process, or a cycle, which begins with a business transaction like a sale. 48. A balance sheet covers a period of time such as a month or year. 49. The legitimate claims of a business's creditors take precedence over the claims of the business owner or owners. 50. The income statement is a financial statement that shows revenues earned and expenses incurred by a business over a specified period of time.
Financial information is useful when it adheres to principles like cost, monetary unit, going concern, and business entity, and displays qualitative characteristics such as relevance and faithful representation.
To ensure the usefulness of financial information, certain principles and characteristics need to be followed. The cost principle (statement 38) states that non-cash transactions should be recorded using their cash-equivalent value.
The monetary unit principle (statement 39) requires transactions to be expressed in a common monetary unit. The going concern principle (statement 40) assumes that a business will continue its operations. The business entity principle (statement 42) necessitates keeping personal and business records separate.
Revenues should be recognized when received in cash (statement 43). The primary qualitative characteristics of financial information are relevance and faithful representation (statement 44). These principles and characteristics, along with financial statements and the conceptual framework, ensure the usefulness of financial information.
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1-In tossing of three coins at a time, the probability of getting exactly two Heads is 1/2.
True
False
2-
Two peoples X and Y apply for a job in a company. The probability of the selection of X is 2/5 and Y is 4/7. Then the probability that both of them selected is:
3/35
1/6
8/35
27/35
The Mean of distribution is 6, the median is 5 and the Mode is 3. It is most likely the distribution is Negatively Skewed.
True
False
1. The probability of getting exactly two Heads when tossing three coins is not 1/2.
2. The probability that both X and Y are selected is 8/35.
3. The distribution is most likely negatively skewed based on the given mean, median, and mode.
The probability of getting exactly two Heads when tossing three coins is not 1/2. When we examine all the possible outcomes of tossing three coins (HHH, HHT, HTH, THH, TTH, THT, HTT, and TTT), we find that only three of them have exactly two Heads. Therefore, the probability of getting exactly two Heads is 3/8, not 1/2.
The probability that both X and Y are selected for the job can be calculated by multiplying their individual probabilities of selection. X has a probability of 2/5 of being selected, and Y has a probability of 4/7. Multiplying these probabilities gives us 8/35, which represents the probability that both X and Y are selected.
The given information about the mean, median, and mode suggests that the distribution is most likely negatively skewed. The fact that the mean is higher than the median indicates the presence of some higher values in the dataset, which pulls the average up.
Additionally, the mode being lower than both the mean and median suggests a clustering of values towards the lower end. These characteristics align with a negatively skewed distribution, where the tail extends towards the left side.
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mathstatistics and probabilitystatistics and probability questions and answersbetween january 9-12, 2013, surveyusa interviewed a random sample of 500 nc residents asking them whether they think widespread gun ownership protects law abiding citizens from crime, or makes society more dangerous. 58% of all respondents said it protects citizens. 67% of white respondents, 28% of black respondents, and 64% of hispanic respondents shared
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Question: Between January 9-12, 2013, SurveyUSA Interviewed A Random Sample Of 500 NC Residents Asking Them Whether They Think Widespread Gun Ownership Protects Law Abiding Citizens From Crime, Or Makes Society More Dangerous. 58% Of All Respondents Said It Protects Citizens. 67% Of White Respondents, 28% Of Black Respondents, And 64% Of Hispanic Respondents Shared
Between January 9-12, 2013, SurveyUSA interviewed a random sample of 500 NC residents asking them whether they think widespread gun ownership protects law abiding citizens from crime, or makes society more dangerous. 58% of all respondents said it protects citizens. 67% of White respondents, 28% of Black respondents, and 64% of Hispanic respondents shared this view. Opinion on gun ownership and race-ethnicity are most likely
A. complementary
B. mutually exclusive
C. dependent
D. independent
Roughly 20% of undergraduates at a university are vegetarian or vegan. What is the probability that, among a random sample of 3 undergraduates, at least one is vegetarian or vegan?
A. 1 - 0.8 * 3
B. 1 - 0.2 * 3
C. 1 - 0.2^3
D. 1 - 0.8^3
The first question is about the relationship between opinion on gun ownership and race-ethnicity. 67% of White respondents, 28% of Black respondents, and 64% of Hispanic respondents shared the view that widespread gun ownership protects law abiding citizens from crime.
The opinion on gun ownership is dependent on race-ethnicity. Roughly 20% of undergraduates at a university are vegetarian or vegan. We need to find the probability that, among a random sample of 3 undergraduates, at least one is vegetarian or vegan.
P(at least one is vegetarian or vegan) = 1 - P(none of them is vegetarian or vegan) P(none of them is vegetarian or vegan)
= (0.8)^3
= 0.512
P(at least one is vegetarian or vegan) = 1 - 0.512
= 0.488
The probability that, among a random sample of 3 undergraduates, at least one is vegetarian or vegan is 0.488.
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! 50 POINTS ! (SIMPLE GEOMETRY PROJECT)
Project Below
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Answer: Please see attached image.
Step-by-step explanation:
Resizing an item uses a transformation called dilation. Dilation is used to enlarge or shrink figures.
A scale factor is the quantity or conversion factor that is used to increase or decrease a figure's size without altering its shape.
For example in 2., we used a scale factor of 1/2 to create a smaller triangle. You simply multiply the scale factor towards the original coordinates (x, y) of the triangle created in 1.
let be the prairie dog population of a certain region, in millions, years after 1975. in 1975 researchers estimated the popuation of 0.3 million. assuming a constant growth rate of 6%, the prairie dog population is modeled by the equation . use this equation to estimate the prairie dog population in 1991. (round to the nearest tenth.)
The prairie dog population in 1991 was estimated to be 0.8 million. This is calculated using the equation , where P is the prairie dog population in millions, t is the number of years after 1975, and r is the growth rate, which is 6%. In 1991, t = 16, so P = 0.3 * (1.06)^16 = 0.8.
The equation P = 0.3 * (1.06)^t models the prairie dog population as a geometric sequence. The first term is 0.3, the common ratio is 1.06, and the number of terms is t. The population in 1991 is calculated by substituting t = 16 into the equation. The answer is rounded to the nearest tenth.
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Find the particular antiderivative that satisfies the following conditions: F(x) = = F'(x) = x³ +8₁√√x; F(1) = -7.
(1 point) Find the particular antiderivative that satisfies the following conditions: H(x) = H'(x) = = 8 x3 3 x6 '; H(1) = 0.
The problem is to find the particular antiderivative that satisfies the given conditions. Firstly, we need to find the antiderivative of F(x), which is x³ + 2 x3/2 + C.
First of all, we find the antiderivative of F(x).F(x) = x³ +8₁√√x
F'(x) = d/dx [x³ +8₁√√x]
F'(x) = 3x² + 4/2₁√√x = 3x² + 2√√x
F(x) = ∫ [3x² + 2√√x] dx = x³ + 2 x3/2 + C
Now, we have to find the particular antiderivative which satisfies the following conditions:
F(1) = -7.F(1) = 1³ + 2(1)3/2 + C = -7⇒ C = -7 - 1³ - 2(1)3/2 = -7 - 2 - 2 = -11
So, the required antiderivative is F(x) = x³ + 2 x3/2 - 11
Therefore, the particular antiderivative that satisfies the given conditions is F(x) = x³ + 2 x3/2 - 11.
Therefore, the particular antiderivative that satisfies the conditions H(x) = H'(x) = = 8 x3 3 x6 '; H(1) = 0 is H(x) = 8/9 x9/2 - x7/2 + C.
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Z is a standard normal random variable. Find P(1.05 ≤Z≤2.13).(score:10)
The probability that Z falls between 1.05 and 2.13 is 0.1307.
We know that a standard normal distribution has a mean of 0 and a standard deviation of 1. We want to find the probability that the random variable Z falls between 1.05 and 2.13.
To solve this problem, we need to find the area under the standard normal curve between the Z-scores of 1.05 and 2.13. We can use a standard normal table or calculator to find this probability.
Using a standard normal table, we can find the probability of Z being less than 2.13 and subtract the probability of Z being less than 1.05.
The value for Z = 2.13 can be looked up in the standard normal table and we find that the corresponding probability is 0.9838.
The value for Z = 1.05 can also be looked up and we find that the corresponding probability is 0.8531.
Therefore, P(1.05 ≤Z≤2.13) = P(Z ≤ 2.13) - P(Z ≤ 1.05) = 0.9838 - 0.8531 = 0.1307.
Therefore, the probability that Z falls between 1.05 and 2.13 is 0.1307.
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How many computers? In a simple random sample of 195 households, the sample mean number of personal computers was 1.48. Assume the population standard deviation is a 0.8. Part 1 of 4 (a) Construct a 90% confidence interval for the mean number of personal computers. Round the answer to at least two decimal places. A 90% confidence interval for the mean number of personal computers is 1.3858 << 1.5742
We can say that with 90% confidence we estimate that the true population mean number of personal computers per household is between 1.3858 and 1.5742.
A simple random sample of 195 households was taken, and the sample mean number of personal computers was 1.48. The population standard deviation is a 0.8. The number of computers is being calculated here
(a)The formula for constructing the confidence interval is:
CI= x ± z* (σ/√n)
Here, the sample mean is given as x = 1.48
Population standard deviation σ = 0.8
Sample size n = 195
The 90% confidence interval means that alpha (α) = 1 - 0.9 = 0.1 on either side.The z-value for alpha/2 = 0.05 is 1.645.Then substituting the values in the formula,
CI = 1.48 ± 1.645 * (0.8/√195)
CI = 1.48 ± 0.112
CI = (1.3858, 1.5742)
Thus, a 90% confidence interval for the mean number of personal computers is 1.3858 << 1.5742.
:Therefore, we can say that with 90% confidence we estimate that the true population mean number of personal computers per household is between 1.3858 and 1.5742.
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Assume that a sample is used to estimate a population mean μ . Find the 98% confidence interval for a sample of size 411 with a mean of 26.2 and a standard deviation of 21.1. Enter your answer as a tri-linear inequality accurate to 3 decimal places. < μ
Therefore, the 98% confidence interval for the population mean μ is approximately (23.96, 28.44).
To find the 98% confidence interval for the population mean μ, we can use the formula:
Confidence Interval = (sample mean) ± (critical value) * (standard deviation / √(sample size))
First, we need to determine the critical value associated with a 98% confidence level. Since the sample size is large (n = 411), we can use the Z-table to find the critical value. For a 98% confidence level, the critical value is approximately 2.326.
Plugging in the given values into the formula, we have:
Confidence Interval = 26.2 ± 2.326 * (21.1 / √(411))
Calculating the standard error (standard deviation / √(sample size)):
Standard Error = 21.1 / √(411)
≈ 1.04
Substituting the values:
Confidence Interval = 26.2 ± 2.326 * 1.04
Calculating the upper and lower bounds of the confidence interval:
Upper bound = 26.2 + (2.326 * 1.04)
≈ 28.44
Lower bound = 26.2 - (2.326 * 1.04)
≈ 23.96
To know more about confidence interval,
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