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A Simple Random Sample of Kitchen Toasters Is to Be σ=28 hours. \sigma = 28 \text { hours. }

Question 20
Multiple Choice
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Multiple Choice

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 σ=28 hours. \sigma = 28 \text { hours. }
Find the sample size needed so that a 95 % confidence interval for the mean lifetime will have a margin of error of 4 .

A) 2
B) 385
C) 189
D) 14

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