1.1 Section Exercise 52 Question 1 of 20 (1 point) Attempt 1 of 1 View question in a popup 2h 18m Remaining
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 85 clamps, the
mean time to complete this step was 41.5 seconds. Assume that the population standard deviation is o 9 seconds. Round the
critical value to no less than three decimal places.
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Part: 0/2
Part 1 of 2
(a) Construct a 99% confidence interval for the mean time needed to complete this step. Round the answer to at least one
decimal place.
A 99% confidence interval for the mean is
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