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# Transcribed Image Text: The waiting times (in minutes) of a random sample of 20 people at a bank have a sample standard deviation of 3.5

Transcribed Image Text: The waiting times (in minutes) of a random sample of 20 people at a bank have a sample standard deviation of 3.5 minutes. Construct a confidence interval for the population variance o and the population
standard deviation a. Use a 90% level of confidence. Assume the sample is from a normally distributed population.
What is the confidence interval for the population variance o2?
(O) (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 greater than
O B. With 10% confidence, you can say that the population variance is between
and
O C. With 90% confidence, you can say that the population variance is less than
O D. With 90% confidence, you can say that the population variance is between
and
What is the confidence interval for the population standard deviation o?
() (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 90% 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 is between
and
minutes.
minutes.
O C. With 10% confidence, you can say that the population standard deviation is less than
O D. With 10% confidence, you can say that the population standard deviation is between
minites
miniutoe and minutne

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