Determine the sample size n needed to construct a 90% confidence interval to estimate the population...
Determine the sample size n needed to construct a 90% confidence interval to estimate the population mean when σ = 57 and the margin of error equals 5
Homework Answers
Alpha=0.10 , sigma = 57 , M.E = 5 , Zc=1.645
ME= Zc * ( sigma / 
n )
n= ( Zc * sigma/ME) 2
n= ( 1.645 * 57 / 5 )2
n= 351.7 ~ 352
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