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March 27, 2015

Homework Help: statistics

Posted by Larry on Tuesday, November 8, 2011 at 11:28am.

A manufacturer wishes to estimate the reliability (in months) of a certain product. An estimate of the population standard deviation from a previous sample was 12 months. If the manufacturer desires to be within 4 months of the true value with approximately 80% confidence, what should the sample size be?

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