Question 4 of 11 (7 points) | AHermpt 1 of 3 | View guestion in a popup 8. 1 Section Exercire 52 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 damp involves the drilling of three holes. In a sample of 55 damps, the mean time to complete this step was $44.9$ seconds. Assume that the population standard deviation is $\sigma=10$ 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 $\square