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

The waiting times (in minutes) of a random sample of 22 people at a bank have a sample standard deviation of 3.6 minutes. Use a 98% level of confidence.
Assume the sample is from a normally distributed population and construct the indicated confidence intervals for
(a) The population variance σ2
(b) The population standard deviation σ. Interpret the results.

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