# Confidence interval and sample size calculation problems

By measuring the amount of time it takes a component of a product to move from one workstation to the next, an engineer has estimated that the standard deviation is 3.22 seconds.

Answer each of the following (show all work):

(A) How many measurements should be made in order to be 98% certain that the maximum error of estimation will not exceed 0.5 seconds?

(B) What sample size is required for a maximum error of 1.5 seconds?

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#### Solution Summary

This solution provides a step by step method for computing the confidence interval and sample size calculation.

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