Confidence Interval for Proportions

The confidence interval for proportions is calculated based on the mean and standard deviation of the sample distribution of a proportion. CI for a population proportion is calculated by taking the point estimation and adding or subtracting it to the margin of error. The most commonly used level of Confidence is 95%. Population Confidence Interval for Proportions Calculation helps you to analyze the statistical probability that a characteristic is likely to occur within the population.

Population Confidence Interval for Proportions Calculation

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Formula:

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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