Question

The waiting times (in minutes) of a random sample of 22 people at a bank have...

The waiting times (in minutes) of a random sample of 22 people at a bank have a mean of 8.2 minutes and a standard deviation of 3.6 minutes. Assume the population has a normal distribution.

a. Construct, by hand, a 99% confidence interval for the standard deviation of all wait times at this bank.

b. Interpret your confidence interval in context of the data.

Homework Answers

Answer #1

b)

true population standard deviation of 99% confidence interval lies between 2.5639 to 5.8205.

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