Estimation of Confidence Intervals for Population Proportions

This tool estimates confidence intervals for population parameters—such as determining whether a candidate is virtually certain to win based on vote share from exit polls.
Enter the sample size (number of exit poll respondents), the number meeting the criteria (number of people who voted for a particular candidate), the confidence interval percentage (e.g., 95%), and the estimation method (choose between Wald and Agresti-Coull), and the confidence interval will be calculated.
*June 24, 2020: Fixed an issue where the results differed from those calculated in R.