Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used to manufacture a metal clamp involved the drilling of three holes. In a sample of 100 clamps the mean time to complete this step was 44.9 seconds. Assume that the population standard deviation is 9 seconds A 99.9% confidence interval for the mean is

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Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used to manufacture a metal clamp involved the drilling of three holes. In a sample of 100 clamps the mean time to complete this step was 44.9 seconds. Assume that the population standard deviation is 9 seconds

A 99.9% confidence interval for the mean is 

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