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help with statistics homework

Statistics
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A population is estimated to have a standard deviation of 8. We want to estimate the population mean within 2, with a 90% level of confidence

How large a sample is required (Round up your answer to the next whole number)

sample required is

Apr 10th, 2015

Sample = (zcrit x sigma / m) ^2.         Here z frit for 90% CI is 1.645

So sample = ( 1.645 x8 /4 ) ^2

                  = ( 6.58) ^2

                  = 43.3

Round up to 44

Answer sample : 44

            

Apr 10th, 2015

I have answered your question.

Niru

Apr 10th, 2015

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