Question: Lifetime of electronics: In a simple random sample of100 electronic components produced by a certain method, the mean lifetime was125 hours. Assume that component lifetimes

Lifetime of electronics:In a simple random sample of100

electronic components produced by a certain method, the mean lifetime was125

hours. Assume that component lifetimes are normally distributed with population standard deviation= 20 hours. Round the critical value to no less than three decimal places.

A sample size of is needed so that a99.8% confidence interval will have a margin of error of4. Round the sample size up to the nearest integer.

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