Question: A research worker wants to determine the average time it takes employees to drive to work each day, and wants to be able to assert

A research worker wants to determine the average time it takes employees to drive to work each day, and wants to be able to assert with 95% confidence that the mean of her sample of off by at most 5 minutes. If she can presume from past experience that the population standard deviation is 15 minutes, how large a sample will she have to take?

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