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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