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help with statistics homework

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A population is estimated to have a standard deviation of 8. We want to estimate the population mean within2, with a 90% level of confidence

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

sample required is

Oct 19th, 2017

zalpha for 90% level of  confidence = 1.65

the standard deviation of sample mean = 8/sqrt(n)

(x-u) /{8/sqrt(n)} = 1.65 

-1<|x-u|<1 

sqrt(n)/8 = 1.65

n = 64*1.65^2 = 174.24  = 175

Apr 12th, 2015

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