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 of 100 clamps, the mean time to complete this step was 56.9 seconds. Assume that the population standard deviation is = 8 seconds. Round the critical value to no less than three decimal places. Part: 0 / 2 Part 1 of 2 (a) Construct a 95% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. A 95% confidence interval for the mean is <μ< X 5

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