The waiting times​ (in minutes) of a random sample of 22 people at a bank have a sample standard deviation of 3.5 minutes. Construct a confidence interval for the population variance σ2 and the population standard deviation σ. Use a 95% level of confidence. Assume the sample is from a normally distributed population. What is the confidence interval for the population variance σ2​?

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The waiting times​ (in minutes) of a random sample of
22
people at a bank have a sample standard deviation of
3.5
minutes. Construct a confidence interval for the population variance
σ2
and the population standard deviation
σ.
Use a
95%
level of confidence. Assume the sample is from a normally distributed population.
What is the confidence interval for the population variance
σ2​?
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