If a quality control manager wants to estimate, with 95% confidence, the mean life of light bulbs

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If a quality control manager wants to estimate, with 95% confidence, the mean life of light bulbs to within ±20 hours and also assumes that the population standard deviation is 100 hours, how many light bulbs need to be selected?

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Statistics For Managers Using Microsoft Excel

ISBN: 772

7th Edition

Authors: David M. Levine, David F. Stephan, Kathryn A. Szabat

Question Posted: Apr 07, 2016 09:05 AM

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If a quality control manager wants to estimate, with 95% confidence, the mean life of light bulbs

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