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A bank wants to cut wait times at the counter so for 8 weeks, they tracked wait time in minutes for the 1 st person

A bank wants to cut wait times at the counter so for 8 weeks, they tracked wait time in minutes for the 1^st person in line after 3 PM.

With a sample mean waiting time of 3.8 minutes with estimated population standard deviation of 1.1 minutes.

Calculate and interpret the 99% confidence interval for the mean waiting time.

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