The waiting times (in minutes) of a random sample of

22

people at a bank have a sample standard deviation of

3.6

minutes. Construct a confidence interval for the population variance.

sigma squared exponent 2.

and the population standard deviation

sigma .

Use a

90 % level of confidence. Assume the sample is from a normally distributed population.

Question content area bottom

Part 1

What is the confidence interval for the population variance?

sigma squared exponent 2? (_____, _______)

(enter your response here)

(Round to one decimal place as needed.)