SOLUTION: you want to obtain a sample to estimate the population proportion you would like to be at 99.9% confident that your estimate is within 4% of the true population proportion how larg

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Question 1176083: you want to obtain a sample to estimate the population proportion you would like to be at 99.9% confident that your estimate is within 4% of the true population proportion how large of a sample size is required?
n=

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Using p = .5 as an example when mean not known.
99.9% confident ( z = 3.09 ) invNorm(.999)
 within 4% 
z = 3.29 (two tailed)
n = %28z%2FME%29%5E2+%28p%281-p%29%29%29
n = %283.09%2F.04%29%5E2+%28.5%28.5%29%29%29 = 1492  (Rounded up to nearest  whole number)

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