7:08 PM Fri Jul 23 54% i www-awu.connectmath.com FER Efficient manufacturing: Efficiency experts study the processes used to manufacture items in order to make them as efficient as olo possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 70 clamps, the mean time to complete this step was 42.2 seconds. Assume that the population standard deviation is o = 9 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 X 5 Part: 1 / 2 Part 2 of 2 (b) Find the sample size needed so that a 98% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 98% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer