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The waiting times​ (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 3.3 minutes. Construct a confidence interval for the population variance σ2 and the population standard deviation σ. Use a 90% level of confidence. Assume the sample is from a normally distributed population.

The waiting times​ (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 3.3 minutes. Construct a confidence interval for the population variance σ2 and the population standard deviation σ. Use a 90% level of confidence. Assume the sample is from a normally distributed population.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The waiting times​ (in minutes) of a random sample of
21
people at a bank have a sample standard deviation of
3.3
minutes. Construct a confidence interval for the population variance
σ2
and the population standard deviation
σ.
Use a
90%
level of confidence. Assume the sample is from a normally distributed population.
The waiting times (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 3.3 minutes. Construct a confidence interval for the population variance o and the population standard deviation o. Use a 90% level of confidence. Assume the sample is from a normally distributed population. What is the confidence interval for the population variance o? D (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) O A. With 10% confidence, you can say that the population variance is less O B. With 90% confidence, you can say that the population variance is between than and OC. With 90% confidence, you can say that the population variance is greater O D. With 10% confidence, you can say that the population variance is between than and What is the confidence interval for the population standard deviation o? (D (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) O A. With 10% confidence, you can say that the population standard deviation is greater than O B. With 90% confidence, you can say that the population standard deviation minutes. is between and minutes. OC. With 90% confidence, you can say that the population standard deviation O D. With 10% confidence, you can say that the population standard deviation is between is less than minutes, minutes and minutes.
Transcribed Image Text:The waiting times (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 3.3 minutes. Construct a confidence interval for the population variance o and the population standard deviation o. Use a 90% level of confidence. Assume the sample is from a normally distributed population. What is the confidence interval for the population variance o? D (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) O A. With 10% confidence, you can say that the population variance is less O B. With 90% confidence, you can say that the population variance is between than and OC. With 90% confidence, you can say that the population variance is greater O D. With 10% confidence, you can say that the population variance is between than and What is the confidence interval for the population standard deviation o? (D (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) O A. With 10% confidence, you can say that the population standard deviation is greater than O B. With 90% confidence, you can say that the population standard deviation minutes. is between and minutes. OC. With 90% confidence, you can say that the population standard deviation O D. With 10% confidence, you can say that the population standard deviation is between is less than minutes, minutes and minutes.
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