A quality control engineer at the National Bullet Company wants to test for the number of defective
Question:
A quality control engineer at the National Bullet Company wants to test for the number of defective bullets (duds) in a case of 1,000. From past experience, he knows that population standard deviation per box is 20 bullets.
If he would like to estimate the mean number of duds with a level of precision of 5 bullets, with a 95 % confidence interval, how large a sample should he take?
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Related Book For 
Statistics For Business And Financial Economics
ISBN: 9781461458975
3rd Edition
Authors: Cheng Few Lee , John C Lee , Alice C Lee
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