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What is formula for calculating sample size of a specific population to obtain a confidence level?
n = [((Za/2)sigma)/E]2
n = sample size
(Za/2) = critical value
sigma = population standard deviation
E = margin of error
This formula can be used when you know sigma and want to determine the necessary sample size to establish, within a confidence of 1-a, the population mean to within +-E.
I won't go into the details of explaining it, because the site I myself am reviewing from right now has an excellent explanation, and I strongly suggest reading through it. Visit it here.
http://www.isixsigma.com/library/content/c000709a.asp
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