Question: 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

  1. 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 involves the drilling of three holes. In a sample of 50clamps, the meantime to accomplish this step was 46.5seconds. Assume that the population standard deviation isseconds. Round the critical value to no less than three decimal places.

(a) Construct a 99.9%confidence interval for the meantime needed to finish this step. Round the answer to at least one decimal place.

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