Formula for confidence interval for population proportion
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Step-by-step explanation:
ci = p ± Zα/2*√(1/n)*p*(1-p)*FPC,
where:
FPC = (N-n)/(N-1),
Zα/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), p is the sample proportion, n is the sample size and N is the population size. Note that a Finite Population Correction (FPC) has been applied to the confidence interval formula.
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