Of which: n = sample size is z = the value of distribution corresponding to the selected reliability (if 95% confidence, the value of z is 1.96...) p = the estimated percentage is% of overall q = 1-p Usually the rate of p and q are estimated at 50%/50% which is the largest capacity can occur. e = error of allowing (± 3%, ± 3%, ± 5% ...)
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