Question: In a manufacturing process, we are interested in measuring the average length of a certain type of bolt. Based on a preliminary sample of 9

In a manufacturing process, we are interested in measuring the average length of a certain type of bolt. Based on a preliminary sample of 9 bolts, the sample standard deviation is .3 inches. How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?

A. 865 B. 80 C. 1470 D. 3989 D. 1197

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