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Efficiency experts study the processes used to manufacture items in order to make them as efficient...

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Statistics

Efficiency experts study the processes used to manufacture itemsin order to make them as efficient as possible. One of the stepsused to manufacture a metal clamp involves the drilling of threeholes. In a sample of 70 clamps, the mean time to complete thisstep was

57.8 seconds. Assume that the population standard deviation is=σ  10

seconds. Round the critical value to no less than three decimalplaces

Construct a 90% confidence interval for the mean time needed tocomplete this step.

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