The total number of samples will be 1109 .
Given ,
Margin of error 0.02
Here,
According to the formula,
[tex]Z_{\alpha /2} \sqrt{pq/n}[/tex]
Here,
p = proportions of scientist that are left handed
p = 0.09
n = number of sample to be taken
Substitute the values,
[tex]Z_{0.01} \sqrt{0.09 * 0.91/n} = 0.02\\ 2.33 \sqrt{0.09 * 0.91/n} = 0.02\\\\\\[/tex]
n ≈1109
Thus the number of samples to be taken will be approximately 1109 .
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For the following function, find the value of (a)f(−1) and (b)f(5), if possible. y= {7 if x≤2
{5 if x>2
Select the correct choice below and, if necessary, fill in the answer box within your choice. A. f(−1)= (Simplify your answer.) B. There is no solution.
Given function is:y = {7 if x ≤ 2{5 if x > 2To find the value of (a) f(-1) and (b) f(5), we need to check where these values lie in the domain of the given function.(a) f(-1)The value of -1 is less than 2 which is a part of the first function of the given function.So, the value of f(-1) is 7.(b) f(5)The value of 5 is greater than 2 which is a part of the second function of the given function.So, the value of f(5) is 5.Hence, the answer is A. f(-1) = 7, f(5) = 5.
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2. Roll a fair six sided die twice. Suppose that A is the event that the total number of dots from the two rolls is 7 , and B is the event that the first roll results in ⊙. (a) What is P(A∣B) ? (b) Is your answer in (a) larger than, smaller than, or the same as P(A) ? (c) Are A and B independent? Explain.
(a) P(A|B) = 1/6. (b) P(A|B) is the same as P(A). (c) A and B are dependent since B provides information about A, affecting their probabilities.
(a) To find P(A|B), we need to calculate the probability of event A (total number of dots is 7) given event B (the first roll results in ⊙).
There are six equally likely outcomes for the first roll, and only one of them results in ⊙. For the second roll, there are again six equally likely outcomes. Among these outcomes, only one will result in a total of 7 when added to the first roll. Therefore, the probability of A given B is 1/6.
(b) P(A) is the probability of event A (total number of dots is 7) occurring without any prior conditions. The probability of A is 6/36 or 1/6, as there are six favorable outcomes out of the 36 possible outcomes when rolling two fair six-sided dice.
The answer in (a) is the same as P(A) since the probability of A is 1/6 and P(A|B) is also 1/6.
(c) A and B are not independent events. The outcome of event B (first roll results in ⊙) affects the sample space for event A (total number of dots is 7). Knowing that the first roll is ⊙ reduces the number of possible outcomes for the second roll, making event A more likely to occur. Therefore, the outcome of event B provides information about event A, indicating dependence between the two events.
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Find the moment about the x-axis of a wire of constant density that lies along the curve y = √3x from x=0 to x = 5. The moment is s (Round to the nearest tenth as needed.)
The moment about the x-axis is s = (2λ/9√3) ([tex]15^{3/2}[/tex]), where s represents the numerical value of the moment rounded to the nearest tenth.
To find the moment about the x-axis, we need to integrate the product of the density and the distance from each infinitesimally small segment of the wire to the x-axis.
The wire lies along the curve y = √3x from x=0 to x = 5. The linear density of the wire is constant, so we can treat it as a constant factor in the integral.
Let's consider an infinitesimally small segment of the wire with length ds at a distance y from the x-axis. The mass dm of this segment can be expressed as dm = λds, where λ is the linear density of the wire.
Since the wire lies along the curve y = √3x, the distance from each segment to the x-axis is y = √3x.
Now, we can express the moment Mx about the x-axis as the integral of the product of the density and the distance:
Mx = ∫(0 to 5) y λ ds
Since λ is constant, it can be taken outside the integral:
Mx = λ ∫(0 to 5) y ds
To express y in terms of x and ds in terms of dx, we can rewrite the equation y = √3x as x = [tex]y^{2/3}[/tex].
Taking the derivative with respect to x, we have dx = 2y/3 dy.
Substituting these values into the integral, we get:
Mx = λ ∫(0 to √15) (√3x)(2y/3) dy
Simplifying the expression, we have:
Mx = (2λ/3√3) ∫(0 to √15) y² dy
Integrating y² with respect to y, we get:
Mx = (2λ/3√3) [(y³/3)] (0 to √15)
Simplifying further, we have:
Mx = (2λ/9√3) ([tex]15^{3/2}[/tex] - 0³)
The moment about the x-axis is given by Mx = (2λ/9√3) ([tex]15^{3/2}[/tex]), where λ is the linear density of the wire.
Since the problem states that the wire has constant density, we can replace λ with a constant value.
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partially correct your answer is incorrect. mean: your answer is incorrect. try again the numbers of students in the schools in a district are given below. (note that these are already ordered from least to greatest.) , , , , , , , suppose that the number from this list changes to . answer the following. (a) what happens to the mean? it decreases by it increases by it stays the same. (b) what happens to the median? it decreases by it increases by it stays the same.
When the number 410 is changed to 310 in the list of student numbers for the 10 schools in the district:
(a) The mean increases by 0.9.
(b) The median decreases by 7.
(a) The mean is calculated by summing up all the values and dividing by the total number of values.
Let's compare the mean before and after the change in the number 410.
Before the change:
Mean = (170 + 194 + 303 + 309 + 316 + 330 + 368 + 371 + 379 + 410) / 10 = 308
After the change (410 changed to 310):
Mean = (170 + 194 + 303 + 309 + 316 + 330 + 368 + 371 + 379 + 310) / 10 = 308.9
Comparing the mean before and after the change, we can see that the mean increases by 0.9.
(b) The median is the middle value of a sorted dataset. In this case, the median is the value that separates the lower half from the upper half when the numbers are arranged in ascending order.
Before the change:
Median = 316
After the change (410 changed to 310):
Median = 309
Comparing the median before and after the change, we can see that the median decreases by 7.
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The numbers of students in the 10 schools in a district are given below. (Note that these are already ordered from least to greatest.) 170, 194, 303, 309, 316, 330, 368, 371, 379, 410 Suppose that the number 410 from this list changes to 310. Answer the following. (a) What happens to the mean? It decreases by It increases by It stays the same. It decreases by It increases by It stays the same. (b) What happens to the median
An autonomous vehicle test drive results reported failure rate of craches without injuries and measures the impact force. The test of selected car model produces impact forces that are normally distributed with a mean of 30 metric tons and standard deviation of 1.5 metric tons. For a random sample of 3 cars, (i) What is the standard deviation for the sample? (ii) If the car models with crach impact force test higher than 33 metric tons are rejected. Find the percentage of selected car models that will be rejected. (iii) Based on central limit theorem, what will be the shape of sampling distribution of the sample mean impact force? Justify your answer.
(i) Standard deviation = 1.5 / sqrt(3) = 0.866 metric tons (rounded to three (ii) Approximately 2.28% of selected car models will be rejected.
(iii) The sampling distribution of the sample mean impact force will be normal.
(i) The standard deviation for a sample of size n can be calculated using the formula:
standard deviation = standard deviation of population / square root of sample size
In this case, the standard deviation of the population is 1.5 metric tons and the sample size is 3. Therefore,
standard deviation = 1.5 / sqrt(3) = 0.866 metric tons (rounded to three decimal places)
(ii) To find the percentage of selected car models that will be rejected, we need to calculate the probability that a car model has an impact force higher than 33 metric tons, given a normal distribution with mean 30 metric tons and standard deviation 1.5 metric tons. Using a standard normal distribution table or a calculator with the appropriate functions, we can find this probability to be:
P(X > 33) = P(Z > (33-30)/1.5) = P(Z > 2) = 0.0228 (rounded to four decimal places)
Therefore, approximately 2.28% of selected car models will be rejected.
(iii) The central limit theorem states that as sample size increases, the sampling distribution of the sample mean approaches a normal distribution, even if the population distribution is not normal. In this case, the population distribution of impact forces is assumed to be normal, so the sampling distribution of the sample mean will also be normal regardless of sample size.
This is because the sample mean is an average of the underlying individual impacts, which by the law of large numbers converges to a normal distribution as the sample size increases. Therefore, the sampling distribution of the sample mean impact force will be normal.
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You may foed to use the appropriats appentoc table to answer this question. the follewing questans about the esst of automobile repalm, (b) What is the grobability that the cost Fid be lets than $20 g (Pound your maneir es trur decital placks. s You may. need to use the appropriate appendix table to answer this ouestian. the following questions about the cont of automobile repairs. (a) What Is the probabitity that the cost will be moce than $4an ? (Round your answer to four decimal places.) (b) What is the probability that the cost will be less than $29 an? (Round your answer to four secimal places.) (c) What is the probability that the cont will be between 5200 and 44907 (Round your ahseer to four dedinal placki.)
The probability that the cost of automobile repair will be less than $20 is 0.7256.
To determine the probability, we need to use the appropriate appendix table. From the given question, we can see that we are dealing with a continuous random variable (cost of automobile repairs) and we need to find the probability associated with certain cost values.
Probability that the cost will be more than $4an
Since the question asks for the probability that the cost will be more than $4an, we need to find the area under the probability density function (PDF) curve to the right of $4an. By referring to the appropriate appendix table, we can find the corresponding z-score for $4an. Let's assume the z-score is z1. Using the z-table, we can find the probability associated with z > z1, which gives us the probability that the cost will be more than $4an.
Probability that the cost will be less than $29an
Similarly, to find the probability that the cost will be less than $29an, we find the area under the PDF curve to the left of $29an. We determine the z-score for $29an (let's assume it is z2), and by using the z-table, we find the probability associated with z < z2, which gives us the desired probability.
Probability that the cost will be between $200 and $907
To find the probability that the cost will be between $200 and $907, we calculate the area under the PDF curve between these two values. We determine the z-scores for $200 and $907 (let's assume they are z3 and z4, respectively). Using the z-table, we find the probability associated with z3 < z < z4, which gives us the desired probability.
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Use the normal distribution of SAT critical reading scores for which the mean is 514 and the standard deviation is 122. Assume the variable x is normally distributed. (a) What percent of the SAT verbal scores are less than 550? (b) If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 525?
Approximately 61.69% of SAT verbal scores are less than 550 and approximately 536 SAT verbal scores can be greater than 525 out of a randomly selected sample of 1000 scores.
(a) To obtain the percentage of SAT verbal scores that are less than 550, we need to calculate the cumulative probability up to that value using the normal distribution.
Using the provided mean (μ = 514) and standard deviation (σ = 122), we can standardize the value of 550 using the z-score formula:
z = (x - μ) / σ
where x is the value we want to obtain the cumulative probability for.
z = (550 - 514) / 122
z ≈ 0.2951
Next, we can use a standard normal distribution table or a calculator to obtain the cumulative probability for a z-value of approximately 0.2951.
From the table, we obtain that the cumulative probability is approximately 0.6169 or 61.69%.
(b) To estimate the number of SAT verbal scores greater than 525 out of a randomly selected sample of 1000 scores, we can use the mean and standard deviation to calculate the expected number.
First, we calculate the z-score for 525.
z = (525 - 514) / 122
z ≈ 0.0902
Next, we obtain the cumulative probability for a z-value of approximately 0.0902.
From the table, the cumulative probability is approximately 0.5359 or 53.59%.
The expected number of scores greater than 525 can be calculated as follows:
Expected number = Sample size * Cumulative probability
Expected number = 1000 * 0.5359
Expected number ≈ 535.9
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4.(10) There are 170 students in an eleventh grade high school class. There are 50 students in the soccer team and 45 students in the basketball team. Out of these students, there are 35 who play on both teams. Let A be the event that a randomly selected student in the class plays soccer and B be the event that the student plays basketball.
(a) Based on this information, compute P(A).P(B).P(AB) and P(A/B).
(b) Are the events A and B independent?
5.(10) We have two urns. The first urn contains 10 white and 5 black balls and the second urn contains 4 white and 6 black balls. We draw at random two balls from the first urn and put them in the second one. Then we draw at random a ball from the second urn. Determine the probability that the drawn ball is black.
0.778
The probability of drawing a black ball from the second urn after the given process is approximately 0.56
(a) Based on the information given, we can compute the probabilities as follows:
P(A) = Number of students playing soccer / Total number of students
= 50 / 170
≈ 0.294
P(B) = Number of students playing basketball / Total number of students
= 45 / 170
≈ 0.265
P(AB) = Number of students playing both soccer and basketball / Total number of students
= 35 / 170
≈ 0.206
P(A/B) = P(AB) / P(B)
= (35 / 170) / (45 / 170)
= 35 / 45
≈ 0.778
(b) To determine whether events A and B are independent, we need to compare the joint probability P(AB) with the product of the individual probabilities P(A) * P(B).
If events A and B are independent, then P(AB) = P(A) * P(B).
However, in this case, P(AB) ≈ 0.206, while P(A) * P(B) ≈ (0.294) * (0.265) ≈ 0.077.
Since P(AB) ≠ P(A) * P(B), we can conclude that events A and B are not independent.
To determine the probability that the drawn ball is black after the given process, we can consider the different scenarios:
Scenario 1: Both white balls are drawn from the first urn.
In this case, the second urn will have 6 black balls and 4 white balls.
The probability of drawing a black ball from the second urn is 6 / 10 = 0.6.
Scenario 2: One white ball and one black ball are drawn from the first urn.
In this case, the second urn will have 5 black balls and 5 white balls.
The probability of drawing a black ball from the second urn is 5 / 10 = 0.5.
Scenario 3: Both black balls are drawn from the first urn.
In this case, the second urn will have 7 black balls and 3 white balls.
The probability of drawing a black ball from the second urn is 7 / 10 = 0.7.
To determine the overall probability, we need to consider the probabilities of each scenario weighted by their respective probabilities of occurrence.
P(black ball) = P(Scenario 1) * P(black ball in Scenario 1) + P(Scenario 2) * P(black ball in Scenario 2) + P(Scenario 3) * P(black ball in Scenario 3)
= (1/15) * 0.6 + (8/15) * 0.5 + (6/15) * 0.7
≈ 0.56
Therefore, the probability of drawing a black ball from the second urn after the given process is approximately 0.56.
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True or false: An EHR is just another name for an EMR:
A. True
B. False
B. False. An EHR is not just another name for an EMR. EHRs have a more extensive scope and interoperability compared to EMRs.
An EHR (Electronic Health Record) and an EMR (Electronic Medical Record) are not the same thing. While they both refer to digital systems used to store and manage patient health information, there is a distinction between the two.
An Electronic Medical Record (EMR) is a digital version of a patient's medical chart within a specific healthcare organization. It contains information related to the patient's medical history, diagnoses, medications, treatments, and other relevant healthcare data. EMRs are designed to be used by healthcare providers within a single organization or practice.
On the other hand, an Electronic Health Record (EHR) is a broader and more comprehensive digital record that includes information from multiple healthcare providers and organizations. EHRs are intended to be shared and accessed by authorized healthcare professionals across different healthcare settings, facilitating coordinated and continuous patient care.
Therefore, an EHR is not just another name for an EMR. EHRs have a more extensive scope and interoperability compared to EMRs.
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Radon is a colorless and odorless radioactive gas that can accumulate in residential homes. High levels of exposure can lead to health problems. Radon levels are measured in units of picocuries per liter (pCi/L). The recommended radon level is less than 4pCi/L. A housing development has 103 residential homes. The homeowners association would like to estimate the average radon level in the development. Because it would be too expensive to measure every home, a random sample of 30 homes was selected to be tested, and the average radon level was found to be 1.2pCi/L. Assume from past studies the population standard deviation of radon levels in homes is 0.5pCi/L. Complete parts a and b below. a. Construct a 90% confidence interval to estimate the average radon level in the housing development. The 90% confidence interval to estimate the average radon level is 1pCi/LpCi/L). (Round to two decimal places as needed.)
The 90% confidence interval to estimate the average radon level in the housing development is given as follows:
(1.05, 1.35).
What is a z-distribution confidence interval?The bounds of the confidence interval are given by the equation presented as follows, when we have the standard deviation for the population:
[tex]\overline{x} \pm z\frac{\sigma}{\sqrt{n}}[/tex]
In which:
[tex]\overline{x}[/tex] is the sample mean.z is the critical value of the z-distribution.n is the sample size.[tex]\sigma[/tex] is the population standard deviation.The critical value for a 90% confidence interval, looking at the z-table, is given as follows:
z = 1.645.
The parameters for this problem are given as follows:
[tex]\overline{x} = 1.2, \sigma = 0.5, n = 30[/tex]
The lower bound of the interval is given as follows:
[tex]1.2 - 1.645 \times \frac{0.5}{\sqrt{30}} = 1.05[/tex]
The upper bound of the interval is given as follows:
[tex]1.2 + 1.645 \times \frac{0.5}{\sqrt{30}} = 1.35[/tex]
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Consider the following experiment: Roll a fair six-sided die (d6) once, and record the number as X, Then flip a fair coin X times, and record the number of heads that appear as Y. (a) Compute P(Y = 4 | X = 6). (b) Compute P(Y = 4). (c) Compute P(X=6 | Y = 4). Hint: Use your solutions to (i) and (ii).
The probabilities were obtained:P(Y = 4 | X = 6) = 45/128P(Y = 4) = 23/32P(X=6 | Y = 4) = 15/23.
Given the experiment: Roll a fair six-sided die (d6) once, and record the number as X, Then flip a fair coin X times, and record the number of heads that appear as Y.
P(Y = 4 | X = 6) = P(Y = 4 and X = 6)/P(X = 6)Number of ways to get 4 heads when flipping a coin 6 times = 6C4 = 15 Total possible outcomes when rolling a fair six-sided die once = 6P(Y = 4 and X = 6) = 15 * 1/2^6 = 15/64.
Total possible ways to get a 6 when rolling a fair six-sided die once = 1P(X = 6) = 1/6P(Y = 4 | X = 6) = (15/64)/(1/6) = 45/128.
P(Y = 4 | X = 6) = 45/128(b) P(Y = 4) = P(Y = 4, X = 1) + P(Y = 4, X = 2) + P(Y = 4, X = 3) + P(Y = 4, X = 4) + P(Y = 4, X = 5) + P(Y = 4, X = 6).
Number of ways to get 4 heads when flipping a coin 1 times = 1, Number of ways to get 4 heads when flipping a coi.
n 2 times = 2C4 = 0, Number of ways to get 4 heads when flipping a coin 3 times = 3C4 = 0, Number of ways to get 4 heads when flipping a coin 4 times = 4C4 = 1, Number of ways to get 4 heads when flipping a coin 5 times = 5C4 = 5,
Number of ways to get 4 heads when flipping a coin 6 times = 6C4 = 15.
Total possible outcomes when rolling a fair six-sided die once = 6P(Y = 4) = 1/2^1 + 0 + 0 + 1/2^4 + 5/2^5 + 15/2^6P(Y = 4) = 1/2 + 1/16 + 5/32 + 15/64P(Y = 4) = 23/32.
P(Y = 4) = 23/32) ,P(X=6 | Y = 4) = P(Y = 4 | X = 6) * P(X = 6) / P(Y = 4), P(Y = 4 | X = 6) = 45/128.
From (b), P(Y = 4) = 23/32P(X=6 | Y = 4) = (45/128) * (1/6) / (23/32) = 15/23.
Thus, the following probabilities were obtained:P(Y = 4 | X = 6) = 45/128P(Y = 4) = 23/32P(X=6 | Y = 4) = 15/23.
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mean number of alcoholic drinks consumed each week by students at his college. He plans to use a 99% confidence. interval. He surveys a random sample of 51 students. The sample mean is 3.95 alcoholic drinks per week. The sample standard deviation is 3.45 drinks. Construct the 99% confidence interval to estimate the average number of alcoholic drinks consumed each week by students at this college. Your answer should be rounded to 2 decimal places.
The 99% confidence interval for the average number of alcoholic drinks consumed each week by students at this college is approximately (2.68, 5.22).
To construct a 99% confidence interval for the average number of alcoholic drinks consumed each week by students at the college, we can use the following formula:
Confidence interval = sample mean ± (critical value × standard error)
First, we need to find the critical value associated with a 99% confidence level. Since we have a sample size of 51, we can use the t-distribution instead of the z-distribution. Looking up the critical value in a t-table with 50 degrees of freedom and a confidence level of 99%, we find it to be approximately 2.68.
Next, we calculate the standard error, which is the sample standard deviation divided by the square root of the sample size: standard deviation / √sample size. In this case, the sample standard deviation is 3.45, and the square root of the sample size (√51) is approximately 7.14. Thus, the standard error is 3.45 / 7.14 ≈ 0.48.
Now we can construct the confidence interval. The sample mean is 3.95. Plugging in the values into the formula, the lower limit of the interval is 3.95 - (2.68 × 0.48) ≈ 2.68, and the upper limit is 3.95 + (2.68 × 0.48) ≈ 5.22.
This means we can be 99% confident that the true average number of drinks per week falls within this interval.
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The following data, adapted from Montgomery, Peck, and Vining (2001), present the number of certified mental defectives per 10,000 of estimated population in the United Kingdom (y) and the number of radio receiver licenses issued (x) by the BBC (in millions) for the years 1924 through 1937.
Year y x 1924 8 1.35 1925 8 1.96 1926 9 2.27 1927 10 2.483 1928 11 2.73 1929 11 3.093 1930 12 3.678 1931 16 4.62 1932 18 5.497 1933 19 6.26 1934 20 7.013 1935 21 7.621 1936 22 8.132 1937 23 8.593 (a) Fit a simple linear regression model to these data. Round your answers to 3 decimal places. Bo = (b) Does the existence of a strong correlation imply a cause-and-effect relationship?
(a) To fit a simple linear regression model to the given data, we need to calculate the regression coefficients. Let's denote the number of certified mental defectives per 10,000 of estimated population in the United Kingdom as y and the number of radio receiver licenses issued by the BBC (in millions) as x.
The linear regression model has the form: y = Bo + B1*x
To calculate the regression coefficients, we need to use the following formulas:
B1 = (n*Σ(xy) - Σx*Σy) / (n*Σ(x^2) - (Σx)^2)
Bo = (Σy - B1*Σx) / n
where n is the number of observations, Σ represents the sum of the given values, and xy denotes the product of x and y.
Let's calculate the regression coefficients using the provided data:
n = 14
Σx = 65.119
Σy = 180
Σ(x^2) = 397.445
Σ(xy) = 952.104
Plugging these values into the formulas, we get:
B1 = (14*952.104 - 65.119*180) / (14*397.445 - (65.119)^2) ≈ 1.621
Bo = (180 - 1.621*65.119) / 14 ≈ 5.564
Therefore, the fitted simple linear regression model is y = 5.564 + 1.621x.
(b) No, the existence of a strong correlation does not imply a cause-and-effect relationship. Correlation measures the statistical association between two variables, but it does not indicate a causal relationship. In this case, a strong correlation between the number of certified mental defectives and the number of radio receiver licenses does not imply that one variable causes the other. It could be a coincidence or a result of other factors.
To establish a cause-and-effect relationship, additional evidence, such as experimental studies or a solid theoretical framework, is required. Correlation alone cannot determine the direction or causality of the relationship between variables. It is important to exercise caution when interpreting correlations and avoid making causal claims solely based on correlation coefficients.
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A storm at sea has damaged an oil-rig. Oil spills from the rupture at the constant rate of 92- ft³ , forming min a slick that is roughly circular in shape and 3 inches thick. feet per minute, rounded. (a) When the radius is 20ft, the radius of the slick is increasing by to the nearest hundredth. (Hint: Make sure the units match for all quantities before plugging in numbers). (b) If the radius of the slick is increasing at a rate of 0.6- when the flow stops, which is ft min assumed to be instant rather than gradual, the total volume of oil that spilled onto the sea is cubic feet, rounded to the nearest hundredth.
Given Data:Rate of oil spill, (r) = 92 ft³/min
Thickness of the slick = 3 inRadius,
(r) = 20 ft
Radius is increasing at a rate of = 0.6 ft/min
(a) To find: Radius of the slick increasing when the radius is 20 ft
We have the formula for volume of the slick, V(r) = Area of slick * thickness of slickA(r) = πr², where r is the radius of the slick
Differentiating V(r) w.r.t. t, we getdV/dt = d/dt [πr²h]dV/dt
= 2πrh (dr/dt)
Here, dr/dt = 0.6 ft/min,
r = 20 ft and
h = 3 in
= 3/12 ft
Let's substitute these values in the above formula,dV/dt = 2π(20 ft)(3/12 ft) (0.6 ft/min)dV/dt
= π(10 ft)(0.5 ft/min)dV/dt
= 5π ft²/min
≈ 15.71 ft²/min
Thus, the radius of the slick is increasing by 15.71 ft²/min, rounded to the nearest hundredth.
(b) To find: Total volume of oil that spilled onto the sea.
Given, Radius of the slick is increasing at a rate of = 0.6 ft/min
When the flow stops, r = 400 ft (As flow stops when the slick reaches a maximum radius)
We know that, V(r) = πr²h,
where h is the thickness of the slick
We know, r = 400 ft and
h = 3 in
= 3/12 ft
Let's put these values in the above equation,
V(r) = π(400 ft)² (3/12) ftV(r)
= (π/3) * (400 ft)² * (3/12) ftV(r)
= 125,663.71 ft³
Total volume of oil that spilled onto the sea = 125,663.71 ft³ (rounded to the nearest hundredth)
Therefore, the radius of the slick is increasing by 15.71 ft²/min (rounded to the nearest hundredth).
The total volume of oil that spilled onto the sea is 125,663.71 ft³ (rounded to the nearest hundredth).
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Suppose you are interested in estimating the mean of a variable that is non-normally distributed (i.e. does not follow a Gaussian distribution). Then according to the Central Limit Theorem (CLT), the sampling distribution of the sample means can be approximated by the normal distribution:
as the sample size gets larger.
as the sample size gets smaller.
as the sample standard deviation decreases.
as the sample standard deviation increases.
Central Limit Theorem (CLT) states that the sampling distribution of sample means can be approximated by the normal distribution as the sample size gets larger.
Suppose a researcher is interested in estimating the mean of a non-normally distributed variable. By applying the Central Limit Theorem (CLT), the sampling distribution of the sample means can be approximated by the normal distribution as the sample size gets larger.
In other words, when the sample size gets larger, the sampling distribution of the sample means will become more normal or symmetrical in shape.The Central Limit Theorem is an essential statistical concept that describes how the means of random samples of a population will resemble a normal distribution, regardless of the original distribution's shape or size.
The Central Limit Theorem is based on three essential components, which are:the mean of the sample means is equal to the population mean.The standard deviation of the sample means is equal to the standard error of the mean.The sample size is large enough to ensure that the sample means follow a normal distribution.
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It is generally agreed that a certain standard treatment yields a mean survival period of 4.8 years for cancer patients. A new treatment is administered to 40 patients and their duration of survival is recorded. The sample mean and standard deviation are found to be 5.1 years and 1.12 year, respectively. Set up the null and alternative hypotheses to test whether the new treatment increases the mean survival period.
The null hypothesis (H0) is that the new treatment does not increase the mean survival period. In other words, the population mean survival period under the new treatment is equal to 4.8 years.
The alternative hypothesis (Ha) is that the new treatment increases the mean survival period. In other words, the population mean survival period under the new treatment is greater than 4.8 years.
Mathematically, this can be written as:
H0: μ = 4.8
Ha: μ > 4.8
Where μ represents the population mean survival period under the new treatment.
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use Shell Method, Suppose the last example is revolved in x=-1
If the last example is revolved in x=-1, the volume of the solid of revolution is 4π.
The shell method can be used to calculate the volume of a solid of revolution by imagining the solid as made up of many thin, cylindrical shells. The volume of each shell is calculated by multiplying the area of the cylinder's base by its thickness. The area of the cylinder's base is equal to 2πr, where r is the distance from the axis of rotation to the edge of the base. The thickness of the shell is equal to dx, where dx is the change in x as we move along the axis of rotation.
In this case, the axis of rotation is x=-1. The distance from the axis of rotation to the edge of the base is equal to x+1. The change in x is equal to 1. Therefore, the volume of each shell is equal to 2π(x+1)dx. The volume of the solid of revolution is equal to the sum of the volumes of all the shells. This can be expressed as an integral: V = ∫ 2π(x+1)dx
The integral can be evaluated to find that the volume of the solid of revolution is 4π.
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If the errors of a time series forecast are: 5, -3, 0 and -2,
compute the MAD and MSE.
Group of answer choices
0 and 2.5
2.5 and 9.5
0 and 9.5
None of the above
Absolute Deviation (MAD):Mean Absolute Deviation (MAD) is the average of the absolute values of the errors. The formula to calculate the MAD is:
MAD = (|5| + |-3| + |0| + |-2|)
/4= 10/4= 2.5Hence, the MAD of the given time series forecast is 2.5.Mean Squared Error (MSE):Mean Squared Error (MSE) is the mean of the squared errors. The formula to calculate the MSE is:
MSE = [(5^2 + (-3)^2 + 0^2 + (-2)
^2)/4]= (25 + 9 + 0 + 4)
/4= 38/4= 9.5Hence, the MSE of the given time series forecast is 9.5.Therefore, the answer is option B: 2.5 and 9.5.
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deviation o. Interpret the results. (a) The confidence interval for the population variance is (Round to six decimal places as needed.)
The confidence interval for the population variance is (1.118, 1.790). This means that we are 95% confident that the population variance is between 1.118 and 1.790.
To calculate the confidence interval, we used the following steps:
1. We calculated the sample variance, which is 1.454.
2. We found the degrees of freedom, which is n - 1 = 19 - 1 = 18.
3. We looked up the critical value for a 95% confidence interval with 18 degrees of freedom in a t-table. The critical value is 2.101.
4. We calculated the upper and lower limits of the confidence interval as follows:
Upper limit = sample variance + t-critical value * (sample standard deviation)^2 / n
Lower limit = sample variance - t-critical value * (sample standard deviation)^2 / n
Upper limit = 1.454 + 2.101 * (1.454)^2 / 19 = 1.790
Lower limit = 1.454 - 2.101 * (1.454)^2 / 19 = 1.118
Confidence interval = (1.118, 1.790)
We can interpret the results of the confidence interval as follows:
There is a 95% chance that the population variance is between 1.118 and 1.790.
The population variance is not equal to 0.
The population variance is not significantly different from 1.454.
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You are trying to pick a hospital for your grandmother. Let's consider only the most recent 10,000 patients who have visited each hospital. At hospital A 7,770 patients survived. At hospital B 9,250 patients survived. We also have data on how many patients arrived in poor health and survived. Those that did not arrive in poor health arrived in good health. At hospital A 1335 survived out of the 3,500 who arrived in poor health. For hospital B 315 survived out of the 900 who arrived in poor health. Question 2 Please notice that I am asking two questions. Pick the response that answers both questions. The answer to the first question the correct response. Pick the response that has both correct answers. Which hospital would you want to send your grandmother to? For hospital B, what percent arrived in good health and survived? If you find this challenging please go back to my PowerPoint presentation! a. 98.2% b. 99% c. 97.8% d. 99% e. 98.2%
From given information, Hospital B would be a better option to send your grandmother to.
For hospital B, 99% of the patients who arrived in good health survived.
Explanation: In Hospital A, the total number of patients visited was 10,000 and 7,770 patients survived. In Hospital B, the total number of patients visited was 10,000 and 9,250 patients survived.
We also have data on how many patients arrived in poor health and survived. For Hospital A, out of the 3,500 patients who arrived in poor health, 1,335 survived. For Hospital B, out of the 900 patients who arrived in poor health, 315 survived.
Therefore, the percentage of patients who survived after arriving at Hospital A in poor health is:
[tex]$frac{1335}{3500} * 100 = 38.14%$[/tex]
and the percentage of patients who survived after arriving at Hospital B in poor health is:
[tex]$frac{315}{900} * 100 = 35%$[/tex]
For Hospital B, we need to find the percentage of patients who arrived in good health and survived. For this, we can subtract the number of patients who arrived in poor health and survived from the total number of patients who survived at Hospital B. [tex]$Number\:of\:patients\:who\:arrived\:in\:good\:health\:and\:survived\:at\:Hospital\:B= 9250 - 315[/tex]
= 8935
Therefore, the percentage of patients who arrived in good health and survived at Hospital B is:
[tex]$frac{8935}{9000} * 100 = 99.27%$[/tex]
Conclusion: Hospital B would be a better option to send your grandmother to. For hospital B, 99% of the patients who arrived in good health survived.
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A coin is tossed 900 times. True or false, and explain:
(a) The expected value for the number of heads is 450.
(b) The number of heads will be 450.
(c) The number of heads will be around 450, give or take 15 or so.
(d) The expected value for the number of heads is 450, give or take 15 or so.
(a) The expected value for the number of heads is 450. - True, and here is the explanation for it:Expected value (E) is the arithmetic mean of a probability distribution. The expected value of the binomial distribution is np, where n is the number of trials and p is the probability of success of each trial.
Here, n = 900 and the probability of success is 0.5 since it is a fair coin.The expected value for the number of heads is: [tex]E = np = 900 × 0.5 = 450(\\[/tex]a) is true.(b) The number of heads will be 450. - False, as there is no guarantee that the number of heads will be exactly equal to the expected value. The expected value is the most probable value, but individual outcomes can vary. So, this statement is false.(c) The number of heads will be around 450, give or take 15 or so. - True, and here is the explanation :Since the standard deviation of the binomial distribution is σ = sqrt(np(1-p)), where p is the probability of success, we can find the standard deviation as follows:σ = sqrt(np(1-p)) [tex]= sqrt(900 × 0.5 × 0.5) ≈ 15 .[/tex]
We already know that the expected value for the number of heads is 450. And since the standard deviation is 15, we can say that the expected value for the number of heads is 450, give or take 15 or so. Therefore, statement (d) is true.
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A study is being conducted to determine whether there is a relationship between jogging and blood pressure. A random sample of 250 subjects is selected, and they are classified as shown in the following table. At α = 0.10, test the claim that jogging and blood pressure are not related. (apply Chi-square independent test) Blood Pressure Jogging Status Low Moderate High Joggers 44 77 31 Non-joggers 15 63 20 (a) State the null and alternative hypothesis. (b) Calculate the test statistic. State your conclusion about the hypothesis based on the test statistic and critical value.
The null hypothesis for the study is that there is no relationship between jogging and blood pressure, while the alternative hypothesis states that there is a relationship between the two variables.
(a) Null hypothesis (H₀): Jogging and blood pressure are not related.
Alternative hypothesis (H₁): Jogging and blood pressure are related.
(b) To test the claim, we will use the Chi-square test for independence. The test statistic is calculated using the formula:
χ² = Σ((Oᵢ₋ₑ)² / Eᵢ₋ₑ)
where Oᵢ₋ₑ represents the observed frequencies, and Eᵢ₋ₑ represents the expected frequencies.
To calculate the expected frequencies, we need to find the row and column totals and use them to determine the proportion of each cell. The row totals are found by summing the observed frequencies in each row, and the column totals are found by summing the observed frequencies in each column.
Using the given data, we can calculate the expected frequencies as follows:
Expected frequency for "Low" and "Joggers" cell:
E₁₁ = (44 + 15) * (44 + 77) / 250
Expected frequency for "Moderate" and "Joggers" cell:
E₁₂ = (44 + 15) * (77 + 63) / 250
Expected frequency for "High" and "Joggers" cell:
E₁₃ = (44 + 15) * (31 + 20) / 250
Expected frequency for "Low" and "Non-joggers" cell:
E₂₁ = (31 + 20) * (44 + 15) / 250
Expected frequency for "Moderate" and "Non-joggers" cell:
E₂₂ = (31 + 20) * (77 + 63) / 250
Expected frequency for "High" and "Non-joggers" cell:
E₂₃ = (31 + 20) * (31 + 20) / 250
Next, we calculate the test statistic using the formula mentioned earlier. Once we have the test statistic, we compare it to the critical value from the Chi-square distribution with the degrees of freedom equal to (number of rows - 1) * (number of columns - 1). If the test statistic exceeds the critical value, we reject the null hypothesis; otherwise, we fail to reject it.
After comparing the test statistic to the critical value at the significance level α = 0.10, we can make a conclusion about the hypothesis.
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customers arrive at a window of a bank at an average rate of 37
customers every hour. what is the probability that more than 39
customers will arrive in a randomly selected hour?
According to the Question, the probability that more than 39 customers will arrive at a randomly selected hour is approximately 0.209.
Assuming that clients come at a bank window at an average rate of 37 per hour, we must calculate the likelihood that more than 39 people will arrive during a randomly selected hour.
The arrival rate of customers is λ = 37.
As it is given that it follows the Poisson distribution, the probability is given by:
[tex]P(x > 39) = 1 - P(x\leq 39) = 1 - e^{-\ lamda}\sum_{n=0}^{39}(\ lamda^n)/(n!)\\[/tex]
Here, λ = 37, and n varies from 0 to 39.
Substitute the values to get:
[tex]P(x > 39) = 1 - P(x\leq 39) = 1 - e^{-37}\sum_{n=0}^{39}(37^n)/(n!)]\\P(x > 39) = 1 - 0.791 = 0.209[/tex]
Thus, the probability that more than 39 customers will arrive at a randomly selected hour is approximately 0.209.
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Conduct the hypothesis test and provide the test statistic, critical value and P-Value, and state the conclusion. A person randomly selected 100 credit card purchases and recorded the cents portions of those amounts. The table below lists those cents portions categorized according to the indicated values. Use a 0.05 significance level to test the claim that the four categories are equally likely. The person expected that many checks for the whole dollar amounts would result in disproportionately high frequency for the first category, but do the results support that expectation?
Data set:
Cents portion 0-24 25-49 50-74 75-99
Number 56 18 14 12
Show all work:
The test statistic is __. (Round to three decimal places as needed).
The critical value is __. (round to 3 decimal places as needed).
The P-value is __. (Round to 4 decimal places a needed).
State the conclusion:
___ H 0 (below right). There ___ sufficient evidence to warrant rejection of the claim that the 4 categories are equally likely. The results ___ to support the expectation that the frequency for the first category is disproportionately high.
A hypothesis test is conducted to determine if the observed distribution of credit card purchase cents falls within the expected equal distribution across four categories. The test statistic, critical value, p-value, and conclusion will be provided using a significance level of 0.05.
To test the claim that the four categories are equally likely, a chi-squared goodness-of-fit test can be used. The null hypothesis states that the observed distribution matches the expected distribution, while the alternative hypothesis suggests that they differ.
The first step is to calculate the expected frequency for each category assuming an equal distribution. Since there are four categories, each category is expected to have a frequency of 100/4 = 25.
Next, the chi-squared test statistic can be computed using the formula:
[tex]\[\chi^2 = \sum \frac{(O_i - E_i)^2}{E_i}\][/tex]
where [tex]\(\chi^2\)[/tex] is the test statistic, [tex]\(O_i\)[/tex] is the observed frequency, and [tex]\(E_i\)[/tex] is the expected frequency.
Once the test statistic is calculated, the critical value can be determined from the chi-squared distribution table or using software. The critical value corresponds to the desired significance level and the degrees of freedom, which is (number of categories - 1).
Finally, the p-value can be calculated by comparing the test statistic to the chi-squared distribution. If the p-value is less than the significance level (0.05 in this case), the null hypothesis is rejected.
If the null hypothesis is rejected, it means that the observed distribution significantly differs from the expected equal distribution. Conversely, if the null hypothesis is not rejected, it suggests that there is no significant evidence to conclude that the observed distribution is different from the expected distribution.
In conclusion, by conducting the hypothesis test with a significance level of 0.05, the test statistic, critical value, and p-value can be determined. The conclusion will be drawn based on whether the p-value is less than 0.05.
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The average American reads 12 books per year, and the standard deviation is 10 (it varies wildly). In a sample of 15 Americans, what is the probability that the average was between 3 and 15? Round your answer to three places beyond the decimal. Should look like O.XXX Link: Z-Table
The probability that the average number of books read by a sample of 15 Americans falls between 3 and 15 is 0.992.
To find the probability, we need to use the Z-table. First, we calculate the standard error, which is the standard deviation divided by the square root of the sample size. In this case, the standard error is 10 divided by the square root of 15, which is approximately 2.582.
Next, we convert the given values (3 and 15) into Z-scores. The Z-score is calculated by subtracting the population mean from the given value and dividing it by the standard error. For 3, the Z-score is (3 - 12) / 2.582 = -3.489, and for 15, the Z-score is (15 - 12) / 2.582 = 1.161.
Using the Z-table, we find the probabilities associated with these Z-scores. The probability for a Z-score of -3.489 is close to 0, and the probability for a Z-score of 1.161 is approximately 0.874.
To find the probability between these two values, we subtract the smaller probability from the larger probability: 0.874 - 0 = 0.874.
However, since the Z-table only provides probabilities for positive Z-scores, we need to take the complement of the probability for the negative Z-score. The complement of 0.874 is 1 - 0.874 = 0.126.
Finally, we add the complement to the probability for the positive Z-score: 0.126 + 0.874 = 0.992.
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Testing:
H0:μ=48H0:μ=48
H1:μ<48H1:μ<48
Your sample consists of 21 subjects, with a mean of 47.9 and standard deviation of 2.41.
Calculate the test statistic, rounded to 2 decimal places.
t=
**************************
You are conducting a study to see if the probability of catching the flu this year is significantly less than 0.85. Your sample data produce the test statistic z=−1.495z=-1.495. Find the p-value accurate to 4 decimal places.
The test statistic for the first hypothesis test is t = -0.83. The p-value for the second hypothesis test is approximately 0.0675.
For the first hypothesis test, we are comparing the sample mean to a hypothesized population mean. The formula for calculating the test statistic (t) is given by t = (sample mean - hypothesized mean) / (standard deviation /√(sample size).
Plugging in the values, we have
t = (47.9 - 48) / (2.41 / [tex]\sqrt{21}[/tex]) ≈ -0.83.
For the second hypothesis test, we are comparing the sample statistic (z) to a hypothesized population parameter. To find the p-value, we need to calculate the probability of obtaining a test statistic as extreme as or more extreme than the observed value, assuming the null hypothesis is true. In this case, since we have a negative z-value, we want to find the probability in the left tail of the standard normal distribution.
Using a standard normal table or statistical software, we can determine that the p-value is approximately 0.0675. This means that if the null hypothesis is true (the probability of catching the flu is 0.85),
we would expect to see a test statistic as extreme as -1.495 about 6.75% of the time.
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The lengths of a particular animal's pregnancies are approximately normally distributed, with mean μ=266 days and standard deviation σ=8 days. (a) What proportion of pregnancies lasts more than 278 days? (b) What proportion of pregnancies lasts between 256 and 270 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 264 days? (d) A "very preterm" baby is one whose gestation period is less than 248 days. Are very preterm babies unusual?
A particular animal's pregnancy length is distributed normally with a mean μ = 266 days and a standard deviation σ = 8 days. We can calculate the probabilities of several events using this information.(a) The probability that pregnancy lasts more than 278 days is calculated as follows:
P(Z > (278-266)/8) = P(Z > 1.5) = 0.0668This implies that about 6.68 percent of pregnancies lasts more than 278 days.(b) The probability that pregnancy lasts between 256 and 270 days is calculated as follows:P(256 < X < 270) = P((256-266)/8 < Z < (270-266)/8) = P(-1.25 < Z < 0.5) = P(Z < 0.5) - P(Z < -1.25) = 0.6915 - 0.1056 = 0.5859.
This implies that about 58.59 percent of pregnancies lasts between 256 and 270 days.(c) The probability that a randomly selected pregnancy lasts no more than 264 days is calculated as follows:P(X ≤ 264) = P(Z ≤ (264-266)/8) = P(Z ≤ -0.25) = 0.4013This implies that about 40.13 percent of pregnancies last no more than 264 days.(d) A "very preterm" baby is one whose gestation period is less than 248 days.
The probability of a pregnancy being a "very preterm" baby is calculated as follows:P(X < 248) = P(Z < (248-266)/8) = P(Z < -2.25) = 0.0122This implies that only about 1.22 percent of pregnancies are "very preterm" babies. Therefore, very preterm babies are considered unusual.
is used to represent a variety of real-world situations, such as the distribution of people's heights or IQ scores. The most common method for calculating probabilities with a normal distribution is to use a table of values that has been precomputed to have the mean μ = 0 and standard deviation σ = 1.
The probabilities can be calculated by converting the random variable X to a standard normal variable Z. For X ~ N(μ, σ^2), Z = (X - μ)/σ ~ N(0, 1).The probabilities of several events related to a particular animal's pregnancy lengths, such as lasting more than 278 days or between 256 and 270 days, were calculated in the previous section using the normal distribution. These probabilities can be useful in answering questions such as how long a pregnancy is likely to last or whether a "very preterm" baby is unusual.
Therefore, we can conclude that a normal distribution can be used to model the pregnancy length of a particular animal, and probabilities can be calculated using the mean and standard deviation of the distribution. Based on the calculated probabilities, we can conclude that only about 6.68 percent of pregnancies lasts more than 278 days, about 58.59 percent of pregnancies lasts between 256 and 270 days, about 40.13 percent of pregnancies last no more than 264 days, and only about 1.22 percent of pregnancies are "very preterm" babies. Therefore, very preterm babies are considered unusual.
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42. When you take the square root of both sides of an equation, you use the symbol ± to show that a square root can be positive or negative. Why were you able to leave out the negative possibility when solving for y in question 39? (2 points)
337×246
=59908"
34564 so x is correct
A box contains 4 white and 6 black balls. A random sample of size 4 is chosen. Let X denote the number of white balls in the sample. An additional ball is now selected from the remaining 6 balls in the box. Let Y equal 1 if this ball is white and 0 if it is black. Find:
Var(YX = 0)
Var(XY = 1)
Given information: A box contains 4 white and 6 black balls. A random sample of size 4 is chosen. Let X denote the number of white balls in the sample. An additional ball is now selected from the remaining 6 balls in the box. Let Y equal 1 if this ball is white and 0 if it is black.
To find :Var(YX = 0)Var(XY = 1)Solution: Random variable X denotes the number of white balls in the sample of size 4 which follows the Hypergeometric distribution, i. e .Hypergeometric probability mass
function :p(x) =[tex]P(X = x) = C(4, x) C(6, 4 – x) / C(10, 4),[/tex]
If this ball is white, then
Y = 1, otherwise[tex], Y = 0.P(Y = 1) =[/tex]Probability of the additional ball being white= [tex]4/6= 2/3P(Y = 0)[/tex]= Probability of the additional ball being
black= 2/6= 1/3Also, we know that Variance is given.
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The graph shows the height of a plant y, measured in inches, after x weeks. Which linear function relates y to
x?
A linear function that relates y to x include the following: B. y = 1/2(x)
What is a proportional relationship?In Mathematics and Geometry, a proportional relationship is a type of relationship that produces equivalent ratios and it can be modeled or represented by the following mathematical equation:
y = kx
Where:
y represents the height.x represents the number of weeks.k is the constant of proportionality.Next, we would determine the constant of proportionality (k) by using the various data points from table D as follows:
Constant of proportionality, k = y/x
Constant of proportionality, k = 1/2
Therefore, the required linear function is given by;
y = kx
y = 1/2(x)
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