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Confidence Interval for Proportions

Calculate the confidence interval (CI) of a proportion with the given inputs of sample size, frequency and chosen confidence level.

Population Confidence Interval for Proportions Calculation

Confidence Level = %
Sample Size (n) =
Frequency (x) =
Confidence Interval for Proportion = < P <
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Formula Used Confidence Interval = p ± Zα/2 × √[(p×q)/n] , (x, n-x≥5) Where, p = x/n q = 1-p α = 1 - (Confidence Level/100) x = Frequency n = Sample Size Zα/2 = Z-table value

Online calculation of Population Confidence Interval (CI) for Proportions is made easier.

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