Efficient manufacturing: Efficiency experts study the processes used to manufact

Question

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 65 clamps, the mean time to complete this step was 48.4 seconds. Assume that t d as possible. One of the steps used to manufacture a metal clamp Check Answer the population standard deviation is sigma = 12 seconds. Construct a 95% confidence internal for the mean time needed to complete this step. Round to one decimal place, if necessary. A 95% confidence interval for the mean is

Explanation / Answer

95% interval will be

(48.4-(1.960*12/Sqrt(65)), 48+(1.960*12/Sqrt(65)))

(45.5, 51.3)

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