Question: Efficient manufacturing: Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used

Efficient manufacturing: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 of55 clamps, the mean time was59.1 seconds. Assume that the population standard deviation is=12

seconds. Round the critical value to no less than three decimal places.

(a) Construct a90% confidence interval for the mean time needed Round the answer to at least one decimal place. A90% confidence interval for the mean is

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