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Assignment on efficient manufacturing

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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 was 44.1 seconds. Assume that the population standard deviation is σ= 7 seconds. Round the critical value to no less than three decimal places.

(a) Construct a 99% confidence interval for the mean time needed to step. Round the answer to at least one decimal place.

(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.

Reference no: EM132880317

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