Free Confidence Interval of a Proportion Calculator - Given N, n, and a confidence percentage, this will calculate the estimation of confidence interval for the population proportion π including the margin of error. confidence interval of the population proportion

This calculator has 3 inputs.

This calculator has 3 inputs.

p^ = n/N

α = 1 - Confidence%

p^ - zscore_{α} * σ_{p}/√ p < p < p^ + zscore_{α} * σ_{p}/√p

For more math formulas, check out our Formula Dossier

α = 1 - Confidence%

p^ - zscore

For more math formulas, check out our Formula Dossier

- confidence interval
- a range of values so defined that there is a specified probability that the value of a parameter lies within it.
- confidence interval of a proportion
- the probability that a population parameter will fall between a set of values for a certain proportion of times.
- margin of error
- a statistic expressing the amount of random sampling error in the results of a survey.

σ_{p}+ z-score - population
- all the inhabitants of a particular town, area, or country.
- proportion
- n equation in which two ratios are set equal to each other

a/b = c/d