Confidence Interval
Binomial proportion confidence intervals at 90%, 95%, or 99% from sample size and success count.
About this tool
Wilson score intervals for a binomial proportion at 90%, 95%, or 99% confidence. Enter the total number of independent binary observations and the number of successes.
The interval describes sampling uncertainty under the binomial model. It does not correct selection bias, correlated observations, changing populations, or measurement error.