SOLUTION: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately σ = 62.4 . We w

Question 1175528: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately
σ
=
62.4
. We would like to be 99.5% confident that the esimate is within 2.5 of the true population mean. How large of a sample size is required?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!


Hi
Normal distribution: σ = 62.4
to be 99.5% confident that the estimate is within 2.5 of the true population mean. 
How large of a sample size is required? invNorm(.995) = 2.5758
ME = 0r n = 
 n =  = 4134 (rounded up to whole number)

Wish You the Best in your Studies.

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