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The waiting times (in minutes) of a random sample of 22 people at a bank have a standard deviation of 3.6 minutes. Construct a 98%

The waiting times (in minutes) of a random sample of 22 people at a bank have a standard deviation of 3.6 minutes. Construct a 98% confidence interval for

(a). the population variance

(b). the standard deviation

Assume the sample is from a normally distributed population.

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