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# A quality engineer wanted to be 98% confident that the maximum error of the estimate of

ISBN: 9780321923271 41

## Solution for problem 7.4-5 Chapter 7.4

Probability and Statistical Inference | 9th Edition

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Problem 7.4-5

A quality engineer wanted to be 98% confident that the maximum error of the estimate of the mean strength, , of the left hinge on a vanity cover molded by a machine is 0.25. A preliminary sample of size n = 32 parts yielded a sample mean of x = 35.68 and a standard deviation of s = 1.723. (a) How large a sample is required? (b) Does this seem to be a reasonable sample size? (Note that destructive testing is needed to obtain the data.)

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