Question
In a simple random sample of100electronic components produced by a certain method, the mean lifetime was125 hours. Assume that component lifetimes are normally distributed with
In a simple random sample of100electronic components produced by a certain method, the mean lifetime was125 hours. Assume that component lifetimes are normally distributed with population standard deviation=20 hours. A99% confidence interval for the mean battery life is
(120)< < (130)
*what sample size is needed so that a 99.9% confidence interval will have a margin of error of 2?*
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Essentials Of College Algebra
Authors: Margaret L Lial, John E Hornsby, David I Schneider, Callie Daniels
11th Edition
