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A simple random sample of kitchen toasters is to be taken

A simple random sample of kitchen toasters is to be taken to determine the mean operational lifetime in hours. Assume that the lifetimes are normally distributed with population standard deviation hours.

Find the sample size needed so that a confidence interval for the mean lifetime will have a margin of error of 4.

Select one:

A. 385

B. 189

C. 14

D. 2

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Basic Statistics: A simple random sample of kitchen toasters is to be taken

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Basic Statistics: A simple random sample of kitchen toasters is to be taken

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