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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 75 clamps, the mean time step was 55.9 seconds. Assume that the population standard deviation is σ= 12 seconds. Round the critical value to no less than three decimal places.
(b) Find the sample size needed so that a 95% confidence interval will have margin of error of 1.5.
A sample size __ of is needed in order to obtain a 95% confidence interval with a margin error of 1.5 Round the sample size up to the nearest integer.
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