To find the value of k for which P(X ≤ 8k) = 0.25, we can use the standardization formula z = (8k - 10) / 2 and solve for k. The value of k is approximately 1.169.
The standardization formula is z = (X - μ) / σ, where X is the random variable, μ is the mean, and σ is the standard deviation.
Substituting the given values into the formula, we have z = (8k - 10) / 2.
Since we want to find the value of k that corresponds to P(X ≤ 8k) = 0.25, we need to find the z-score that corresponds to the cumulative probability of 0.25.
Using a standard normal distribution table or a calculator, we find that the z-score corresponding to a cumulative probability of 0.25 is approximately -0.674.
Setting z = -0.674, we can solve for k:
-0.674 = (8k - 10) / 2
Solving this equation, we find k = 1.169.
Therefore, for P(X ≤ 8k) = 0.25, the value of k is approximately 1.169.
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Let P(x, y) be a propositional function. Show Ex Vy P(x, y) → Vy Ex P(x, y) is a tautology. Jert word that
Since we have shown below that Ex Vy P(x, y) → Vy Ex P(x, y) is always true, regardless of the truth values of P(x, y), we can conclude that it is a tautology.
We need to show that the implication Ex Vy P(x, y) → Vy Ex P(x, y) is a tautology, which means it is always true regardless of the truth values of P(x, y).
To prove that Ex Vy P(x, y) → Vy Ex P(x, y) is a tautology, we can use a proof by contradiction.
Step 1: Assume that Ex Vy P(x, y) → Vy Ex P(x, y) is not a tautology, i.e., there exists an assignment of truth values to P(x, y) that makes the implication false.
Step 2: Consider the case where Ex Vy P(x, y) is true, but Vy Ex P(x, y) is false under this assignment. This means that there exists an x such that for all y, P(x, y) is false, and for every y, there exists an x such that P(x, y) is true.
Step 3: From the assumption, we have Ex Vy P(x, y), which means there exists an x such that for all y, P(x, y) is true. However, this contradicts the statement that for all y, there exists an x such that P(x, y) is false.
Step 4: Therefore, the assumption made in Step 1 leads to a contradiction, and we conclude that Ex Vy P(x, y) → Vy Ex P(x, y) is a tautology.
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2. [10] X and Y are two independent random variables having geometric distributions with parameter p. Recall P(X=x)=p(1−p)x−1,x=1,2,. a) Find the density of Z=min(X,Y) b) Find the density of the sum (X+Y). c) Calculate P(Y≥X) d) Calculate EZ
The sum of these densities is [tex](z) = p(1-p)^{z-1}[/tex]
a) Find the density of Z=min(X,Y)
The density of Z=min(X,Y) is given by:
[tex]f_Z(z) = p(1-p)^{z-1}[/tex]
where z is the value of Z and p is the parameter of the geometric distributions.
To find this, we can use the fact that the density of Z is the sum of the densities of X and Y, where X and Y are both less than or equal to z.
The density of X is given by:
[tex]f_X(x) = p(1-p)^{x-1}[/tex]
The density of Y is given by:
[tex]f_Y(y) = p(1-p)^{y-1}[/tex]
The sum of these densities is
[tex]f_Z(z) = p(1-p)^{z-1}[/tex]
b) Find the density of the sum (X+Y)
The density of the sum (X+Y) is given by:
[tex]f_{X+Y}(z) = p^2(1-p)^z[/tex]
where z is the value of X+Y and p is the parameter of the geometric distributions.
To find this, we can use the fact that the density of X+Y is the convolution of the densities of X and Y.
The convolution of two densities is the sum of all possible products of the densities, where the products are weighted by the probability that X and Y take on those values.
In this case, the possible products are:
X = 1, Y = 1
X = 1, Y = 2
X = 1, Y = 3
X = n, Y = n
The probability that X and Y take on these values is:
[tex]p^2(1-p)^n[/tex]
The sum of these probabilities is the density of X+Y
[tex]f_{X+Y}(z) = p^2(1-p)^z[/tex]
c) Calculate P(Y≥X)
The probability that Y≥X is given by:
[tex]P(Y≥X) = 1 - P(X > Y)[/tex]
We can use the fact that P(X>Y) is the probability that X is greater than Y, which is the same as the probability that X is equal to 1 and Y is greater than 1.
The probability that X is equal to 1 is p.
The probability that Y is greater than 1 is 1-p.
Therefore, the probability that X>Y is p(1-p).
The probability that [tex]Y≥X is 1-p(1-p).[/tex]
d) Calculate EZ
The expected value of Z is given by:
[tex]E(Z) = \sum_{z=1}^\infty z f_Z(z)[/tex]
where [tex]f_Z[/tex]([tex]z[/tex]) is the density of Z.
The sum can be evaluated using the following steps:
1. Expand the terms in the sum.
2. Factor out a constant from each term.
3. Combine the terms that have the same value of z.
4. Evaluate the sum.
The result is:
[tex]E(Z) = \frac{1}{1-p}[/tex]
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Find parametric equations for the line that is tangent to the given curve at the given parameter value. r(t) = (5 cos t) + (1²-4 sin t)j + (2 62¹) k. t=0 What is the standard parameterization for the tangent line? X = y = Z= (Type expressions using t as the variable.)
The given curve is, r(t) = (5 cos t) + (1²-4 sin t)j + (2 62¹) k and the parameter value is t=0.The vector that is tangent to a curve at a particular point is called the tangent vector.
In this case, we need to find the parametric equations for the line that is tangent to the given curve at the parameter value t = 0. Here's the solution to the problem, To find the parametric equation, we must differentiate the given equation w.r.t t and then substitute t=0.
r(t) = (5 cos t) + (1²-4 sin t)j + (2 62¹) k
Differentiating w.r.t t, we get:
r'(t) = -5sin(t)i - 4cos(t)j + 12k
Substituting t=0 in the above equation, we get:
r'(0) = -5i + 4j + 12k
So, the vector equation of the tangent line is:
X = 5tY = 4t + 1Z = 12t
The given curve is,
r(t) = (5 cos t) + (1²-4 sin t)j + (2 62¹) k
and the parameter value is t=0. We are required to find the parametric equations for the line that is tangent to the given curve at the parameter value t = 0. To find the tangent line, we need to differentiate the given equation w.r.t t and then substitute t=0. Differentiating w.r.t t, we get:
r'(t) = -5sin(t)i - 4cos(t)j + 12k.
Substituting t=0 in the above equation, we get:
r'(0) = -5i + 4j + 12k.
So, the vector equation of the tangent line is:
X = 5t, Y = 4t + 1, Z = 12t.
Hence, the standard parameterization for the tangent line is:
(5t, 4t + 1, 12t).
Therefore, the standard parameterization for the tangent line is X = 5t, Y = 4t + 1, Z = 12t, where t is the variable.
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Factor the difference an+1 - an to show that the given sequence {an} is strictly increasing or strictly decreasing n 11n + 10 n=1 ; strictly increasing ; strictly increasing ; strictly decreasing ; strictly decreasing ; strictly increasing an+1 = an = +oo 10 (11n + 10)(11n +21)' 10 (11n10)(11n +21)' 10 (11n + 10)(11n +21) 10 (11n10)(11n - 21)' 11 (11n + 10)(11n + 21)'
By factoring the difference an+1 - an and observing that it is a positive constant, we conclude that the sequence {an} = 11n + 10 is strictly increasing.
To determine whether the sequence {an} defined as an = 11n + 10 is strictly increasing or strictly decreasing, we can factor the difference an+1 - an. By analyzing the factors, we can determine the behavior of the sequence. In this case, by factoring the difference, we find that it is a positive constant, indicating that the sequence {an} is strictly increasing.
Let's calculate the difference an+1 - an for the given sequence {an} = 11n + 10:
an+1 - an = (11(n+1) + 10) - (11n + 10)
= 11n + 11 + 10 - 11n - 10
= 11n + 11 - 11n
= 11
We can see that the difference, an+1 - an, is a positive constant, specifically 11. This means that the terms of the sequence {an} increase by a constant value of 11 as n increases.
When the difference between consecutive terms of a sequence is a positive constant, it indicates that the sequence is strictly increasing. This is because each term is larger than the previous term by a fixed amount, leading to a strictly increasing pattern.
Therefore, we can conclude that the sequence {an} defined as an = 11n + 10 is strictly increasing.
It's important to note that the factorization process you mentioned in your question seems to contain some errors. The correct factorization of the difference an+1 - an is simply 11, not any of the expressions you provided.
In summary, by factoring the difference an+1 - an and observing that it is a positive constant, we conclude that the sequence {an} = 11n + 10 is strictly increasing.
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A quality control engineer at Shell visits 78 gas stations and collects a fuel sample from each. She measures the sulphur content in the gas and sorts the samples into 4 different batches. She finds: 17 samples with less than 180 ppm sulphur, 23 samples between 180 and 230 ppm, 20 samples between 230 and 280 ppm, and 18 samples with more than 280 ppm. Does the sulphur content of the fuel samples follow a normal distribution with a mean of 225 ppm and a standard deviation of 44 ppm? Give the statistic and the P-value. Statistic number (rtol=0.01, atol=0.0001) P-value number (rtol=0.01, atol=0.0001) What is your conclusion at a 5% significance level? ? (a) The test is inconclusive (b) The sulphur content of gas does not follow the stated distributio
To determine if the sulphur content of the fuel samples follows a normal distribution with a mean of 225 ppm and a standard deviation of 44 ppm, a statistical test is performed. The test statistic and p-value are obtained, and based on the 5% significance level, a conclusion is drawn.
To test the hypothesis, a chi-square goodness-of-fit test can be used to compare the observed frequencies of sulphur content in each batch with the expected frequencies under the assumption of a normal distribution with the given mean and standard deviation.
Calculating the test statistic and p-value, if the p-value is less than the significance level (0.05), we reject the null hypothesis and conclude that the sulphur content of the gas does not follow the stated normal distribution. On the other hand, if the p-value is greater than or equal to 0.05, we fail to reject the null hypothesis and the test is inconclusive.
The specific values of the test statistic and p-value were not provided in the question, so it is not possible to determine the conclusion without those values.
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Consider a random variable X having cdf
FX (x) = { 1, x ≥ 2,
x+1/3 , −1 < x < 2,
0, x ≤ −1.
(a) Give the pdf of X. (Note: Based on the material covered in the 8th lecture of the semester, you should be able to conclude that the density of X is that of the uniform distribution having mean 0.5 and variance 0.75.)
(b) Give the cdf of Y = |X|. (Note: Since g(x) = |x| is not a monotone function on the support of X, (−1, 2), the "method of transformations" (see p. 255 of text) cannot be used. Instead, one should use the "cdf method" (aka, "method of distribution functions" (p. 253 of text)).
a. the pdf of X is:
fX(x) = 1, -1 < x < 2
= 0, otherwise
b. the CDF of Y = |X| is:
FY(y) = 0, y < 0
y + 2/3, 0 ≤ y < 1/3
2y + 2/3, 1/3 ≤ y < 2
1, y ≥ 2
(a) To find the probability density function (pdf) of X, we need to differentiate the cumulative distribution function (CDF) with respect to x in the appropriate intervals.
For -1 < x < 2, the CDF is given by FX(x) = x + 1/3. Taking the derivative of this function, we get:
fX(x) = d/dx (FX(x))
= d/dx (x + 1/3)
= 1
Therefore, for -1 < x < 2, the pdf of X is fX(x) = 1.
Outside this interval, for x ≤ -1 and x ≥ 2, the CDF is either 0 or 1. Thus, the pdf is 0 in these regions.
In summary, the pdf of X is:
fX(x) = 1, -1 < x < 2
= 0, otherwise
(b) We want to find the cumulative distribution function (CDF) of Y = |X|. Since g(x) = |x| is not a monotone function on the support of X, we cannot directly use the method of transformations.
Instead, we will use the "cdf method" or "method of distribution functions." We need to calculate P(Y ≤ y) for different values of y.
For y < 0, P(Y ≤ y) = 0 since the absolute value of X cannot be negative.
For 0 ≤ y < 1/3, P(Y ≤ y) = P(-1/3 < X < y) = FX(y) - FX(-1/3) = (y + 1/3) - (-1/3) = y + 2/3.
For 1/3 ≤ y < 2, P(Y ≤ y) = P(-y < X < y) = FX(y) - FX(-y) = (y + 1/3) - (-y + 1/3) = 2y + 2/3.
For y ≥ 2, P(Y ≤ y) = P(-y < X < y) = FX(y) - FX(-y) = 1 - (-y + 1/3) = y + 2/3.
Therefore, the CDF of Y = |X| is:
FY(y) = 0, y < 0
y + 2/3, 0 ≤ y < 1/3
2y + 2/3, 1/3 ≤ y < 2
1, y ≥ 2
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Question 4. Samples of size n = 5 are taken from a manufacturing process every hour. A quality characteristic is measured, and X and R are computed for each sample. After 25 samples have been analyzed, we have 25 i=1 x=662.50 and R = 9.00 inl The quality characteristic is normally distributed. (a) Find the control limits for the X and R charts. (b) Assume that both charts exhibit control. If the specifications are 26.40 +0.50, estimate the fraction nonconforming. (c) If the mean of the process were 26.40, what fraction nonconforming would result?
(a) The control limits for the X-chart are UCLx = X-double bar + A2 * R-bar and LCLx = X-double bar - A2 * R-bar. The control limits for the R-chart are UCLR = D4 * R-bar and LCLR = D3 * R-bar.
(b) To estimate the fraction nonconforming, we calculate the proportion of measurements outside the specification limits using the X-chart and R-chart.
(c) The fraction non-conforming is 0 if the process mean is exactly 26.40.
(a) To find the control limits for the X and R charts, we need to calculate the average range (R-bar) and the control limits based on the given data.
For the X-chart:
The control limits for the X-chart can be calculated using the following formula:
Upper Control Limit (UCLx) = X-double bar + A2 * R-bar
Lower Control Limit (LCLx) = X-double bar - A2 * R-bar
For the R-chart:
The control limits for the R-chart can be calculated using the following formula:
Upper Control Limit (UCLR) = D4 * R-bar
Lower Control Limit (LCLR) = D3 * R-bar
where X-double bar is the average of the sample means (x-bar), R-bar is the average range, and A2, D3, and D4 are constants based on the sample size.
Given that n = 5, we can use the appropriate values from the control chart constants table.
(b) Assuming both charts exhibit control, we can estimate the fraction nonconforming by calculating the proportion of measurements that fall outside the specification limits. We can use the X-chart to estimate the process mean and the R-chart to estimate the process variation.
(c) The fraction non-conforming is a function of the process mean. If the mean were exactly 26.40, there would be no products outside the specification limits, resulting in a fraction non-conforming of 0.
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The table below shows the crude and age adjusted rates for Mortality from Penetrative Trauma between two populations. Population A Population B Crude Rate (per 10,000) Adjusted Rate (per 10,000) 92 124 23 31 Which of the following is the best response? a. The comparison of the adjusted rates was confounded by age b. More information is needed to make an interpretation c. The comparison of the crude rates was not confounded by age d. The comparison of the crude rates was confounded by age
The best response to this question is option A. The comparison of the adjusted rates was confounded by age
Age adjustment is a statistical method that is used to eliminate the impact of age differences between populations when making a comparison of mortality rates.
The crude rate is a raw mortality rate that has not been adjusted for any differences in the age structure of the population.
In this case, the crude rate for population B (124 per 10,000) is higher than the crude rate for population A (92 per 10,000).
However, because the populations may differ in age, an age adjustment may be necessary to make an accurate comparison of mortality rates.
The age-adjusted rates for the two populations are 31 per 10,000 for population B and 23 per 10,000 for population A.
This adjustment suggests that the difference in crude rates may be due to differences in the age structure of the populations being compared.
Therefore, the comparison of the adjusted rates was confounded by age
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Consider an experiment that was conducted at CARE. Depo-Provera is used to suppress the reproduction of females and they tested whether this drug may also lower male aggression (a real threat to male baboons, I saw two attacks while there) and increase positive social behaviors. As part of her Master's thesis, Hannah measured positive social behaviors by males before and after receiving the drug. The data to the right is hypothetical positive social action data, but similar to the data she got. You will do an unpaired t test and two paired t tests (one and two tailed) on this data.
Individual: 1 2 3 4 5 6 7 8 9 10 11 12
Before: 43 29 38 37 44 40 32 36 39 34 40 43
After: 41 38 43 43 46 44 35 44 36 38 42 42
The correct test statistics is -1.854 and degree of freedom is 20.
Let [tex]\mu_{1}[/tex] shows the mean of positive social behaviors by males before drug and [tex]\mu_{2}[/tex] shows the mean of positive social behaviors by males after drug.
Null hypothesis:
[tex]H_{0}:\mu_{1}=\mu_{2}[/tex]
[tex]H_{a}:\mu_{1} < \mu_{2}[/tex]
Alternative hypothesis is claim.
By the table shows the mean and variances of the data set:
ndividual: 1 2 3 4 5 6 7 8 9 10 11 12
Before: 43 29 38 37 44 40 32 36 39 34 40 43
After: 41 38 43 43 46 44 35 44 36 38 42 42
Mean - 37.91667
Variances - 21.17424
From the given data we have following information:
[tex]n_{1}=n_{2}=12, \bar{x}_{1}=37.9167,s^{2}_{1}=21.1742, \bar{x}_{2}=41,s^{2}_{2}=12[/tex]
Since it is not given that variances are equal so degree of freedom of the test is
[tex]df=\frac{\left ( \frac{s_{1}^{2}}{n_{1}}+\frac{s_{2}^{2}}{n_{2}} \right )^{2}}{\frac{\left ( s_{1}^{2}/n_{1} \right )^{2}}{n_{1}-1}+\frac{\left ( s_{2}^{2}/n_{2} \right )^{2}}{n_{2}-1}}=20[/tex]
And test statistics will be
[tex]t=\frac{\bar{x}_{1}-\bar{x}_{2}}{\sqrt{\frac{s_{1}^{2}}{n_{1}}+\frac{s_{2}^{2}}{n_{2}}}}=-1.854[/tex]
P-value of the test is : 0.0392
Therefore, the test statistics is -1.854 and degree of freedom is 20.
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Incomplete Question:
Consider an experiment that was conducted at CARE. Depo-Provera is used to suppress the reproduction of females and they tested whether this drug may also lower male aggression (a real threat to male baboons, I saw two attacks while there) and increase positive social behaviors. As part of her Master's thesis, Hannah measured positive social behaviors by males before and after receiving the drug. The data to the right is hypothetical positive social action data, but similar to the data she got. You will do an unpaired t test and two paired t tests (one and two tailed) on this data.
Individual: 1 2 3 4 5 6 7 8 9 10 11 12
Before: 43 29 38 37 44 40 32 36 39 34 40 43
After: 41 38 43 43 46 44 35 44 36 38 42 42
a, 2 pts ea) Conduct a two-tailed unpaired heteroscedastic t test on this data and fill in the blanks to the right. df = ______ tcalc = ______ (round df to the correct whole number).
1. The frequency distribution for the number of losses when there is no deductible is negative binomial with r = 3 and ß = 5. Loss amounts have a Weibull distribution with T = 0.3 and 0 = 1000 (cumulative distribution function F(x) = 1 - exp(-))): a. Determine the distribution of the number of payments when a deductible of 200 is applied. Justify your answer. b. Determine the expected number of payments when a deductible of 200 is applied.
The expected number of payments when a deductible of 200 is applied is approximately 1.8.
a. When a deductible of 200 is applied, it means that the losses below 200 will not result in any payments. The distribution of the number of payments will then be the same as the distribution of the number of losses above 200. In the negative binomial distribution with r = 3 and ß = 5, the probability mass function (PMF) gives the probability of having k failures before r successes. In this case, the number of losses above 200 can be considered as the number of failures before reaching 3 successful payments. b. To determine the expected number of payments when a deductible of 200 is applied, we need to calculate the expected value of the distribution of the number of losses above 200.
The expected value of a negative binomial distribution with parameters r and ß is given by E(X) = r(1-ß)/ß, where X is the random variable representing the number of losses. In this case, the number of losses above 200 follows a negative binomial distribution with r = 3 and ß = 5. Therefore, the expected number of losses above 200 is E(X) = 3(1-5)/5 = -6/5. Since the number of payments is equal to the number of losses above 200 plus 3 (the deductible), the expected number of payments is -6/5 + 3 = 9/5, which is approximately 1.8. Therefore, the expected number of payments when a deductible of 200 is applied is approximately 1.8.
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A sample size must be determined for estimating a population mean given that the confidence level is 95% and the desired margin of error is 0.23. The largest value in the population is thought to be 15 and the smallest value is thought to be 7. Complete parts a and b below. a. Calculate the sample size required to estimate the population mean using a generously large sample size. (Hint: Use the range/4 option.) The sample size required is Round up to the nearest whole number as needed.) b. If a conservatively small sample size is desired, calculate the required sample size. (Hint: Use the range/6 option.) Discuss why the answers in parts a and b are different. Select the correct choice below and fill in the answer box within your choice. (Round up to the nearest whole number.) 。A. The sample size required is This sample size is larger than the sample size in part a because it is found using a smaller estimate of the population standard deviation. O B. The sample size required is This sample size is smaller than the sample size in part a because it is found using a smaller estimate of the population standard deviation OC. The sample size required is.This sample size is smaller than the sample size in part a because it is found using a larger estimate of the population standard deviation. O D. The sample size required is This sample size is larger than the sample size in part a because it is found using a larger estimate of the population standard deviation.
The formula to determine the sample size for estimating the population mean is as follows:n = ((z* σ) / E)^2where, z = the z-score that corresponds to the level of confidence selectedσ = the population standard deviationE = the desired margin of error.
For the given problem, the following values have been provided:z = 1.96 (corresponding to 95% confidence level)σ = (15 - 7) / 4 = 2 (using range/4 option)E = 0.23a) The sample size required to estimate the population mean using a generously large sample size is as follows:n = ((1.96 * 2) / 0.23)^2n ≈ 241.4 ≈ 242 Hence, the sample size required (rounded up to the nearest whole number) is 242.b) The sample size required for a conservatively small sample size is as follows:n = ((1.96 * 2) / (0.23 * 3))^2n ≈ 58.8 ≈ 59 Hence, the sample size required (rounded up to the nearest whole number) is 59.
The sample size required is This sample size is smaller than the sample size in part a because it is found using a larger estimate of the population standard deviation. Therefore, option (C) is correct.
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Express as a single logarithm. 3 loga (2x+1)-2 loga (2x-1)+2 OA. log 2(x+1) OB. loga (2x+3) a² (2x + 1)³ OC. log a (2x-1)² O D. loga (2x+1)+2
The expression 3 loga (2x+1) - 2 loga (2x-1) + 2 can be simplified to loga (((2x+1)³)/((2x-1)²)) + 2.
To express the expression as a single logarithm, we can use the properties of logarithms to simplify it. Let's go step by step:
3 loga (2x+1) - 2 loga (2x-1) + 2
Using the properties of logarithms, we can rewrite this expression as a single logarithm:
loga ((2x+1)³) - loga ((2x-1)²) + 2
Now, applying the quotient rule of logarithms, we can combine the logarithms with a subtraction:
loga (((2x+1)³)/((2x-1)²)) + 2
Therefore, the expression 3 loga (2x+1) - 2 loga (2x-1) + 2 can be simplified to loga (((2x+1)³)/((2x-1)²)) + 2.
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Assume that hybridization experiments are conducted with peas having the property that for offspring, there is a 0.25 probability that a pea has green pods. Assume that the offspring peas are randomly selected in groups of 32 . Complete parts (a) through (c) below. a. Find the mean and the standard deviation for the numbers of peas with green pods in the groups of 32
The mean and standard deviation of the numbers of peas with green pods in the groups of 32 are 8 and 2, respectively.
a. The mean and standard deviation for the numbers of peas with green pods in the groups of 32 are 8 and 2, respectively.
The number of peas with green pods in the groups of 32 is binomially distributed with parameters
n = 32 and p = 0.25.
We have to use the formula for the mean and the standard deviation of a binomial distribution to solve this problem:
μ = np
= 32 × 0.25
= 8
σ =√(np(1 - p)) =
√(32 × 0.25 × 0.75) ≈ 2
Thus, we can say that the mean and standard deviation of the numbers of peas with green pods in the groups of 32 are 8 and 2, respectively.
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A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength of thread B by at least 9 kilograms. Researchers wish to test this claim using a 0.1 level of significance. How large should the samples be if the power of the test is to be 0.95 when the true difference between thread types A and B is 8 kilograms? The population standard deviation for thread A is 6.19 kilograms and the population standard deviation for thread B is 5.53 kilograms. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The minimum sample size required is (Round up to the nearest whole number as needed.)
The minimum sample size required (rounded up) is 1.
Given:
- Significance level [tex](\(\alpha\))[/tex] = 0.1
- Power [tex](\(1 - \beta\))[/tex] = 0.95
- True difference [tex](\(\delta\))[/tex] = 8 kilograms
- Population standard deviation for thread A [tex](\(\sigma_A\))[/tex] = 6.19 kilograms
- Population standard deviation for thread B [tex](\(\sigma_B\))[/tex] = 5.53 kilograms
- Default [tex]\(Z_{\alpha/2}\)[/tex] = -1.645
- Default [tex]\(Z_\beta\)[/tex] = 1.282
Using the formula:
[tex]\[ n = \left(\frac{{(Z_{\alpha/2} + Z_\beta) \cdot (\sigma_A^2 + \sigma_B^2)}}{{\delta^2}}\right) \][/tex]
Substituting the values:
[tex]\[ n = \left(\frac{{(-1.645 + 1.282) \cdot (6.19^2 + 5.53^2)}}{{8^2}}\right) \][/tex]
Calculating this expression:
[tex]\[ n = \left(\frac{{-0.363 \cdot (38.3161 + 30.5809)}}{{64}}\right) \][/tex]
[tex]\[ n = \left(\frac{{-0.363 \cdot 68.897}}{64}\right) \][/tex]
[tex]\[ n = \left(\frac{{-24.993}}{64}\right) \][/tex]
Taking the absolute value and rounding up to the nearest whole number:
[tex]\[ n = \lceil \frac{{24.993}}{{64}} \rceil = 1 \][/tex]
Therefore, the minimum sample size required (rounded up) is 1.
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Use the matrices A and B given below to compute the indicated entries of E=A T
−B. Enter all answers in exact, reduced form. (Answers involving variables are case sensitive.) A= ⎣
⎡
−1
−5q
14m
13
4
8n
⎦
⎤
B=[ −11v
9w
−3
−2r
−14
1
] (a) e 21
= (b) a 31
−b 23
+e 12
=
Given matrix A = [[-1, -5q, 14m, 1348n]] and matrix B = [[-11v, 9w, -3, -2r, -141]], we need to compute the entries of E = A^T - B.
The transpose of matrix A, denoted as A^T, is obtained by interchanging the rows and columns of matrix A. So, A^T = [[-1], [-5q], [14m], [1348n]].
To compute e21, we find the entry at the second row and first column of E, which is obtained by subtracting the corresponding entries of A^T and B. Therefore, e21 = -1 - (-11v) = 11v - 1.
To compute a31 - b23 + e12, we consider the entry at the third row and first column of A^T, subtract b23 from it, and add e12. Thus, a31 - b23 + e12 = 14m - (-3) + (-5q) = 14m + 3 - 5q.
The final answers for (a) e21 and (b) a31 - b23 + e12 are 11v - 1 and 14m + 3 - 5q, respectively, in exact, reduced form.
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Solve for w. 9w=5w+20 Simplify your answer as much as possible. W = 0 8 X
the solution to the equation 9w = 5w + 20 is w = 5.
To solve the equation 9w = 5w + 20, we can start by simplifying both sides of the equation. By subtracting 5w from both sides, we obtain:
9w - 5w = 5w - 5w + 20
Simplifying further, we have:
4w = 20
To isolate the variable w, we divide both sides of the equation by 4:
4w/4 = 20/4
This simplifies to:
w = 5
Therefore, the solution to the equation 9w = 5w + 20 is w = 5.
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a. State a conclusion about the null hypothesis. (Reject H 0
or fail to reject H 0
) Choose the correct answer below. A. Fail to reject H 0
because the P.value is less than or equal to α. B. Fail to reject H 0
because the P-value is greater than α. C. Reject H 0
because the P-value is greater than α. D. Reject H 3
because the P-value is less than or equal to a. b. Without using technical terms, state a final conclusion that addresses the original caim. Which of the following is the correct conctusion? A. There is not sufficient evidence to support the claim that the percentage of adults that would erase all of their personal information online it thay could is more than 47%. B. T we percentage of adults that would erase all of their personal information online in thay could is more than 47%. C. The percentage of adults that would erase all of their pernonal information online if they could is less than or equal to A7%. D. There is sufficient evidence to support the ciaim that the percentage of aduhs that would erase all of their personal intormation online if they could is more than 47%
A). A. Fail to reject H 0 because the P.value is less than or equal to α. is the correct option. Without using technical terms.
There is not sufficient evidence to support the claim that the percentage of adults that would erase all of their personal information online is more than 47%. The correct option is A. We fail to reject the null hypothesis when the p-value is greater than α. It indicates that the sample evidence is not strong enough to support the alternative hypothesis. In this case, the p-value is less than or equal to α, so we fail to reject the null hypothesis (H0).
A final conclusion that addresses the original claim is drawn based on the hypothesis test results. If the null hypothesis is not rejected, the conclusion is drawn in terms of the null hypothesis. Therefore, the correct conclusion is:There is not sufficient evidence to support the claim that the percentage of adults that would erase all of their personal information online is more than 47%.Option A is the correct option.
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Find the absolute maximum value and absolute minimum value of
the function (x)=x1/3 on the interval [1,4] . Express your answer
exactly, without rounding.
Find the absolute maximum value and absolute minimum value of the function \( f(x)=x^{1 / 3} \) on the interval \( [1,4] \). Express your answer exactly, without rounding.
The absolute maximum value is 2sqrt{3}{2} and absolute minimum value is 1.
The given function is f(x)=x^{1 / 3}. To find the absolute maximum value and absolute minimum value of the function f(x)=x^{1 / 3} on the interval [1,4], we differentiate the function and equate it to zero.
Hence, the derivative of f(x)=x^{1 / 3} is given by
[f(x)= frac{d}{dx} x^{1 / 3} = frac{1}{3} x^{-2 / 3}
Now, equating this to zero,
frac{1}{3} x^{-2 / 3}=0
Simplifying it, we get,
x^{-2 / 3}=0
Which is not possible as we know that any non-zero number to the power 0 is 1.
Therefore, there are no critical points between 1 and 4. Also, the function is continuous and differentiable on the interval [1,4].
Thus, the maximum value and minimum value of
f(x)=x^{1 / 3}
on the interval [1,4] is at either end of the interval, i.e. f(1) and f(4).
Therefore, Absolute Maximum Value of f(x)=x^{1 / 3} on the interval [1,4] is f(4) = 4^{1 / 3} which is equal to 2sqrt[3]{2}
and the Absolute Minimum Value of f(x)=x^{1 / 3} on the interval [1,4] is f(1) = 1^{1 / 3} which is equal to 1.
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Determine whether the following sets of vectors are bases for R³ (a) {(1,0,1), (1,1,0), (0,1,1), (2,1,1)} (b) {(1,0,1), (1,1,0), (1,2,−1)} (c) {(1,0,1),(0,1,1), (1,2,-1)}
all three sets {(1,0,1), (1,1,0), (0,1,1), (2,1,1)}, {(1,0,1), (1,1,0), (1,2,-1)}, and {(1,0,1), (0,1,1), (1,2,-1)} form bases for R³.
For the set {(1,0,1), (1,1,0), (0,1,1), (2,1,1)}:
To check linear independence, we can form a matrix with these vectors as columns and row reduce it. If the row-reduced form has only the trivial solution, the vectors are linearly independent. In this case, the row-reduced form has only the trivial solution, indicating linear independence.
To check spanning, we need to see if the set of vectors can generate any vector in R³. Since the row-reduced form has only the trivial solution, the vectors span R³.
Thus, the set {(1,0,1), (1,1,0), (0,1,1), (2,1,1)} forms a basis for R³.
For the set {(1,0,1), (1,1,0), (1,2,-1)}:
To check linear independence, we row reduce the matrix formed by these vectors. The row-reduced form has only the trivial solution, indicating linear independence.
To check spanning, we need to verify if the vectors can generate any vector in R³. Since the row-reduced form has only the trivial solution, the vectors span R³.
Thus, the set {(1,0,1), (1,1,0), (1,2,-1)} forms a basis for R³.
For the set {(1,0,1), (0,1,1), (1,2,-1)}:
To check linear independence, we row reduce the matrix formed by these vectors. The row-reduced form has only the trivial solution, indicating linear independence.
To check spanning, we need to verify if the vectors can generate any vector in R³. Since the row-reduced form has only the trivial solution, the vectors span R³.
Thus, the set {(1,0,1), (0,1,1), (1,2,-1)} forms a basis for R³.\
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Write the following systems as a matrix equation and solve it using the inverse of coefficient matrix. You can use the graphing calculator to find the inverse of the coefficient matrix.
7x1 +2x2 +7x3 =59
2x1+x2+ x3=15
3x1 +4x2 +9x3 =53
The solution to the system of equations is:
x1 = 5, x2 = 2, x3 = 1.
To solve the given system of equations using the inverse of the coefficient matrix, we will follow the steps outlined in the previous explanation.
Step 1: Write the system of equations as a matrix equation AX = B.
The coefficient matrix A is:
A = [[7, 2, 7], [2, 1, 1], [3, 4, 9]]
The column matrix of variables X is:
X = [[x1], [x2], [x3]]
The column matrix of constants B is:
B = [[59], [15], [3]]
Step 2: Find the inverse of the coefficient matrix A.
The inverse of matrix A, denoted as A^(-1), can be obtained using a graphing calculator or by performing matrix operations. The inverse of A is:
A^(-1) = [[13, -6, -1], [-3, 4, -1], [-2, 1, 1]]
Step 3: Solve for X by multiplying both sides of the equation AX = B by A^(-1).
X = A^(-1) * B
Substituting the values of A^(-1) and B into the equation, we have:
X = [[13, -6, -1], [-3, 4, -1], [-2, 1, 1]] * [[59], [15], [3]]
Performing the matrix multiplication, we obtain:
X = [[5], [2], [1]]
Therefore, the solution to the system of equations is:
x1 = 5, x2 = 2, x3 = 1.
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Solve the system dx = -5x + 2y dt dy = - 3x dt with the initial value x(0) = -1 y(0) = -3 x(t) = y(t) = = 1
The particular solution for the given system of differential equations with the initial values x(0) = -1 and y(0) = -3 is: x(t) = -e^(t) - e^(10t), y(t) = 3e^(t) + 3e^(10t) - 3.
To solve the given system of differential equations, we can use the method of simultaneous equations. Here are the steps to find the solution:
Step 1: Start with the given system of equations:
dx/dt = -5x + 2y
dy/dt = -3x
Step 2: We can solve this system by finding the derivatives of x and y with respect to t. Taking the derivative of the first equation with respect to t, we get:
d²x/dt² = -5(dx/dt) + 2(dy/dt)
Step 3: Substitute the given equations into the derivative equation:
d²x/dt² = -5(-5x + 2y) + 2(-3x)
Simplifying,
d²x/dt² = 25x - 10y - 6x
d²x/dt² = 19x - 10y
Step 4: Now, we have a second-order linear differential equation for x. We can solve this equation using the standard methods. Assuming a solution of the form x(t) = e^(rt), we can find the characteristic equation:
r² - 19r + 10 = 0
Step 5: Solve the characteristic equation for the values of r:
(r - 1)(r - 10) = 0
r₁ = 1, r₂ = 10
Step 6: The general solution for x(t) is given by:
x(t) = c₁e^(t) + c₂e^(10t), where c₁ and c₂ are constants.
Step 7: To find y(t), we can substitute the solution for x(t) into the second equation of the system:
dy/dt = -3x
dy/dt = -3(c₁e^(t) + c₂e^(10t))
Step 8: Integrate both sides with respect to t:
∫dy = -3∫(c₁e^(t) + c₂e^(10t))dt
Step 9: Evaluate the integrals:
y(t) = -3(c₁e^(t) + c₂e^(10t)) + c₃, where c₃ is another constant.
Step 10: Using the initial values x(0) = -1 and y(0) = -3, we can substitute these values into the solutions for x(t) and y(t) to find the values of the constants c₁, c₂, and c₃.
x(0) = c₁e^(0) + c₂e^(0) = c₁ + c₂ = -1
y(0) = -3(c₁e^(0) + c₂e^(0)) + c₃ = -3(c₁ + c₂) + c₃ = -3(-1) + c₃ = -3 + c₃ = -3
From the first equation, c₁ + c₂ = -1, and from the second equation, c₃ = -3.
Step 11: Substitute the values of c₁, c₂, and c₃ back into the solutions for x(t) and y(t) to obtain the particular solution:
x(t) = c₁e^(t) + c₂e^(10t) = (-1)e^(t) + (-1)e^(10t)
y(t) = -3(c₁e^(t) + c₂e^(10t)) + c₃ = -3((-1)e^(t) + (-1)e^(10t)) - 3
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Assume a significance level of α=0.1 and use the given information to complete parts (a) and (b) below. Original claim: The mean puise rate (in beats per minute) of a cortain group of adult males is 69 bpm. The hypothesis test results in a P.value of 0.0797. a. State a conclusion about the null hypothesis. (Reject H 6
or fall to reject H 0
-) Choose the correct answer below. A. Reject H 0
because the P-value is less than or equal to α. B. Fail to reject H 0
bocause the P-value is less than or equal to a. C. Reject H 0
because the P-value is greater than α. D. Fail to reject H 0
because the P-value is greater than α. b. Without using technical terms, state a final conclusion that addresses the original claim. Which of the following is the correct conclusion? A. The mean pulse rate (in beats per minute) of the group of adult males is not 69 bpm.
The correct conclusion is that the mean pulse rate (in beats per minute) of the group of adult males is not 69 bpm.
a. State a conclusion about the null hypothesis. (Reject H0 or fail to reject H0-) Choose the correct answer below. A. Reject H0 because the P-value is less than or equal to α. b. Without using technical terms, state a final conclusion that addresses the original claim. Which of the following is the correct conclusion? A. The mean pulse rate (in beats per minute) of the group of adult males is not 69 bpm. Using the given information,α = 0.1P-value = 0.0797The original claim, The mean pulse rate (in beats per minute) of a certain group of adult males is 69 bpm. Null hypothesis:H0: The mean pulse rate (in beats per minute) of a certain group of adult males is 69 bpm.
Alternative hypothesis:H1: The mean pulse rate (in beats per minute) of a certain group of adult males is not 69 bpm. Conclusion: As the P-value (0.0797) is less than α (0.1), we Reject H0. Therefore, we conclude that there is sufficient evidence to support the claim that the mean pulse rate (in beats per minute) of the group of adult males is not 69 bpm. Thus, the correct conclusion is that the mean pulse rate (in beats per minute) of the group of adult males is not 69 bpm.
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Use cylindrical coordinates. Evaluate ∭ E
x 2
+y 2
dV a
where E is the region that les inside the cylinder x 2
+y 2
=4 and between the planes z=2 and z=7,
The value of the integral ∭ E x 2 + y 2 dV a in cylindrical coordinates is (7π/20).
In mathematics, we frequently encounter the problem of evaluating triple integrals over a three-dimensional region E. This question examines the use of cylindrical coordinates to solve this type of issue. The integral we must evaluate in this question is
∭ E x 2 + y 2 dV a.
E is the area that exists within the cylinder x 2 + y 2 = 4 and between the planes z = 2 and z = 7.
Therefore, we can say that the integral in cylindrical coordinates is as follows:
∭ E x 2 + y 2 dV = ∫∫∫ E ρ³sin(θ) dρ dθ dz.
To solve this issue, we must first define E in cylindrical coordinates. E can be defined as
E = {(ρ,θ,z) : 0 ≤ θ ≤ 2π, 0 ≤ ρ ≤ 2, 2 ≤ z ≤ 7}.
As a result, the limits of ρ, θ, and z are as follows: 0 ≤ θ ≤ 2π, 2 ≤ z ≤ 7, and 0 ≤ ρ ≤ 2.
Substituting x = ρ cos θ, y = ρ sin θ, and z = z in x 2 + y 2 = 4, we get ρ = 2.
Using these values in equation (1), we get
∭ E x 2 + y 2 dV = ∫ 0² 2π ∫ 2⁷ ∫ 0 ρ³sin(θ) dρ dθ dz.
Substituting the limits of ρ, θ, and z in equation (2), we obtain
∭ E x 2 + y 2 dV = ∫ 0² 2π ∫ 2⁷ [ρ⁴/4] ρ=0 dθ dz
∭ E x 2 + y 2 dV = ∫ 0² 2π ∫ 2⁷ ρ⁴/4 dθ dz
∭ E x 2 + y 2 dV = ∫ 0² 2π [(ρ⁵/20)] ρ=2 dz
∭ E x 2 + y 2 dV = (π/2) ∫ 2⁷ [ρ⁵/20] ρ=2 dz
∭ E x 2 + y 2 dV = (π/2) [z²/20] 7₂
∭ E x 2 + y 2 dV = (7π/20).
Therefore, the value of ∭ E x 2 + y 2 dV a in cylindrical coordinates is (7π/20).
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QUESTION 19 A researcher would like to determine if a new procedure will decrease the production time for a product. The historical average production time is μ= 46 minutes per product. The new procedure is applied to n=16 products. The average production time (sample mean) from these 16 products is = 42 minutes with a sample standard deviation of s = 7 minutes The p-value for the hypothesis test is p-value= 0.019. using a level of significance of α = 0.05, determine if we reject or fail to reject the null hypothesis.
Fail to reject the null. There is sufficient evidence to conclude new procedure decreases production time.
Reject the null. There is sufficient evidence to conclude the new procedure decreases production time.
Reject the null. There is insufficient evidence to conclude the new procedure decreases production time.
Fail to reject the null. There is insufficient evidence to conclude the new procedure decreases production time.
Fail to reject the null hypothesis . There is insufficient evidence to conclude the new procedure decreases production time.
Given,
Historical average production time:
μ = 46 minutes.
Now,
A random sample of 16 parts will be selected and the average amount of time required to produce them will be determined. The sample mean amount of time is = 42 minutes with the sample standard deviation s = 7 minutes.
So,
Null Hypothesis, [tex]H_{0}[/tex]: μ ≥ 46 minutes {means that the new procedure will remain same or increase the production mean amount of time}
Alternate Hypothesis, [tex]H_{0}[/tex] : μ < 45 minutes {means that the new procedure will decrease the production mean amount of time}
The test statistics that will be used here is One-sample t test statistics,
Test statistic = X - μ/σ/[tex]\sqrt{n}[/tex]
where,
μ = sample mean amount of time = 46 minutes
σ = sample standard deviation = 7 minutes
n = sample of parts = 16
Substitute the values,
Test statistic = 42 - 46 /7/4
Test statistic = -2.28
Thus the value of test statistic is -2.28 .
Now ,
The degree of freedom can be calculated by,
df = n-1
df = 15
Thus,
Fail to reject the null. There is insufficient evidence to conclude the new procedure decreases production time.
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Consider the taxi metric given by d /< (x, y) = (x₁ - x₂ / + / 3₁ = Isl d= (x₁y) = √ (92-4₁) ² + (x₂-x₁)² 27 Prove that de is 22 / +13₁_gallixty Goz 112 113 a metric. ·lent mentries on given set Define two equivaler Prove that of is equivalent to do on Re /14 frove that ce is not equivalent to do on R² tok find the boundary of closed ball B[0;2] in (Rice) 117 find the distance between (3,0) and $ [0,1] in 18₁4)
We are given a metric, denoted by d /<(x, y), and we need to prove that it satisfies the properties of a metric.
Specifically, we need to show that it satisfies the non-negativity, identity of indiscernibles, symmetry, and triangle inequality properties. Additionally, we need to find the boundary of the closed ball B[0;2] in the given metric and calculate the distance between two points.
To prove that d /<(x, y) is a metric, we need to verify the following properties:
Non-negativity: d /<(x, y) ≥ 0 for all x, y and d /<(x, y) = 0 if and only if x = y.
Identity of indiscernibles: d /<(x, y) = d /<(y, x) for all x, y.
Symmetry: d /<(x, y) + d /<(y, z) ≥ d /<(x, z) for all x, y, z.
Triangle inequality: d /<(x, y) ≤ d /<(x, z) + d /<(z, y) for all x, y, z.
Once we have verified these properties, we can conclude that d /<(x, y) is a metric.
To find the boundary of the closed ball B[0;2], we need to determine the set of points on the boundary. This can be done by finding the points that have a distance of exactly 2 from the center (0,0) in the given metric.
Finally, to calculate the distance between two points, say (3,0) and $ [0,1], we need to substitute these values into the given metric equation and evaluate the expression.
By addressing these steps, we can prove that d /<(x, y) is a metric, find the boundary of B[0;2], and calculate the distance between two specified points in the given metric space.
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True or False (2.5 points each; do NOT need to show work): (a) If f 3
is continuous, then f is continuous. (b) Any monotone sequence that is bounded from below must converge. (c) If 0
≤a<1 for all n∈N, then the sequence {(c n
) n/2
} converges to zero. (d) If f is differentiable, then ∣f∣ 2
is differentiable.
(a) False. The statement "If f is continuous, then f 3 is continuous" is not necessarily true. The continuity of f does not guarantee the continuity of f cubed. For example, consider the function f(x) = -1 for x < 0 and f(x) = 1 for x ≥ 0. This function is continuous, but f cubed is not continuous at x = 0.
(b) False. The statement "Any monotone sequence that is bounded from below must converge" is incorrect. A monotone sequence that is bounded from below can still diverge. For instance, the sequence (n) (where n is a natural number) is monotonically increasing and bounded from below, but it diverges to infinity.
(c) False. The statement "If 0 ≤ a < 1 for all n ∈ N, then the sequence {(c n ) n/2} converges to zero" is not true. Without specific information about the sequence (c n ), we cannot make conclusions about its convergence. It is possible for a sequence to have terms between 0 and 1 but still diverge or converge to a value other than zero.
(d) False. The statement "If f is differentiable, then |f| 2 is differentiable" is not generally true. The absolute value function |f(x)| is not differentiable at points where f(x) crosses zero. Therefore, |f| 2 (the square of the absolute value of f) may not be differentiable for certain values of f(x) and thus does not follow from f being differentiable.
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a. For the standard normal distribution, find the value z0 satisfying each of the following conditions.
a) P(−z 0
The value z0 satisfying the given condition is 1.645.
Given, P(−z0≤z≤z0)=0.9
The standard normal distribution table provides the probabilities of a standard normal variable taking a value less than a given value z.
To find the value z0 that satisfies P(−z0≤z≤z0)=0.9 ,
we look up the probability in the standard normal distribution table.
This probability is in the body of the table, not the tail.
We must therefore look for a probability of 0.95 in the body of the standard normal distribution table and read off the corresponding value of z, say z0.
Note that since the standard normal distribution is symmetric, we have P(Z ≤ −z0) = P(Z ≥ z0).Using a standard normal distribution table, we get z0=1.645 (to 3 decimal places).
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It can be shown that y₁ = 2, y2 = x and y = 2 are solutions to the differential equation 2D3y+10x D2y+ 18Dy= 0 on (0, [infinity]). What does the Wronskian of y1, 92, 93 equal?
The Wronskian of the solutions y₁ = 2, y₂ = x, and y = 2 to the given differential equation is to be determined.
The Wronskian is a determinant defined for a set of functions. For the given solutions y₁ = 2, y₂ = x, and y = 2, the Wronskian can be calculated as follows:
W(y₁, y₂, y₃) = | y₁ y₂ y₃ |
| y₁' y₂' y₃' |
| y₁'' y₂'' y₃'' |
Taking the derivatives of the given solutions, we have:
y₁' = 0
y₁'' = 0
y₂' = 1
y₂'' = 0
y₃' = 0
y₃'' = 0
Substituting these values into the Wronskian determinant, we get:
W(y₁, y₂, y₃) = | 2 x 2 |
| 0 1 0 |
| 0 0 0 |
Expanding the determinant, we have:
W(y₁, y₂, y₃) = 2(10 - 00) - x(00 - 02) + 2(00 - 10)
= 0
Therefore, the Wronskian of y₁ = 2, y₂ = x, and y = 2 is equal to zero.
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a.Studies have shown that the average number of moves a person makes in his or her lifetime is 12. If the standard deviation is 3.5, find the probability that the average for a sample of 36 randomly selected people is less than 11. Show your work.
b.Before the current Covid-19 situation, 81% of people had never ordered groceries online. (My guess is this percent has changed now!) Assuming this is still accurate, what is the probability that in a sample of 250 people, less than 190 have never ordered groceries online? Show your work.
Using the standard normal distribution table, the probability that the z-score is less than -2.07 is 0.0192.Therefore, the probability that in a sample of 250 people, less than 190 have never ordered groceries online is 0.0192 or 1.92%.Hence, the answer is given by, "a. The probability that the average for a sample of 36 randomly selected people is less than 11 is almost 0. b. The probability that in a sample of 250 people, less than 190 have never ordered groceries online is 0.0192 or 1.92%."
a) Given information: Average number of moves is 12, standard deviation is 3.5 and sample size n=36We can use central limit theorem to find the probability that the average for a sample of 36 randomly selected people is less than 11.
The formula for z-score
isz = (x - μ) / (σ / sqrt(n))Here, μ = 12, σ = 3.5 and n = 36For x = 11, z = (11 - 12) / (3.5 / sqrt(36))= -3 / 0.583= -5.15.
Using the standard normal distribution table, the probability that the z-score is less than -5.15 is almost 0.Therefore, the probability that the average for a sample of 36 randomly selected people is less than 11 is almost 0.b) Given information: P(never ordered groceries online) = 0.81, sample size n = 250We can use the normal approximation to the binomial distribution to find the probability that less than 190 people have never ordered groceries online in a sample of 250 people.
The formula for normal approximation to binomial
isz = (x - μ) / σHere, μ = np = 250 × 0.81 = 202.5σ = sqrt(npq) = sqrt(250 × 0.81 × 0.19) = 6.03For x = 190, z = (190 - 202.5) / 6.03= -12.5 / 6.03= -2.07.
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You are a space alien. You visit planet Earth and abduct 97chickens, 47 cows, and 77 humans. Then, you randomly select one Earth creature from your sample to experiment on. Each creature has an equal probability of getting selected. what is the probability the Chicken the cow and the human will be selected?
The probability of selecting the chicken, cow, and human is (1/97) * (1/47) * (1/77).
When randomly selecting one creature from the sample of 97 chickens, 47 cows, and 77 humans, each creature has an equal probability of being selected. Therefore, the probability of selecting the chicken is 1 out of 97 (1/97), the probability of selecting the cow is 1 out of 47 (1/47), and the probability of selecting the human is 1 out of 77 (1/77).
To find the probability of all three events happening together (selecting the chicken, cow, and human in that order), we multiply the individual probabilities. This is because the events are independent, meaning the selection of one creature does not affect the probabilities of selecting the others.
Multiplying the probabilities, we have:
(1/97) * (1/47) * (1/77) ≈ 0.000000000274
Therefore, the probability of selecting the chicken, cow, and human is approximately 0.000000000274.
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