Get the population standard deviation (σ) and sample size (n). The sample confidence interval proportion is a binomial proportion in a statistical population. The precision of a confidence interval is determined by its width: the less wide the interval, the more accurate the estimate drawn from the data. The smaller the margin of error, the more confidence you may have in your results. As a result, the solution will be both the upper and lower bounds of that range of values. Confidence interval for a proportion This calculator uses JavaScript functions based on code developed by John C. Pezzullo . Click on the "Calculate" button to generate the outputs. Margin of error, also called confidence interval, tells you how much you can expect your survey results to reflect the views from the overall population. Now that you know how margin of error is calculated and how it affects your results, let’s review the steps that you need to follow to use these concepts in your survey design. Imagine you are trying to decide between Name A and Name B for a new product and your target market consists of 400,000 potential customers. Strictly speaking, an interval computed using any CI calculator either contains or does not contain the true value. supports HTML5 video, Calculator Academy© - All Rights Reserved 2020, how to calculate confidence interval in excel, confidence interval calculator proportion, t value for 95 confidence interval calculator, margin of error confidence interval calculator, confidence interval for population mean calculator, confidence interval calculator without standard deviation, confidence interval for population proportion calculator, find sample size given margin of error and confidence level calculator, how to calculate 95 confidence interval in excel, point estimate of the population mean calculator, two sample confidence interval calculator, confidence interval calculator for two samples, how to calculate confidence interval in r, lower and upper bound confidence interval calculator, construct a confidence interval calculator, 95 percent confidence interval calculator, t distribution confidence interval calculator, confidence interval calculator for two proportions, how to find margin of error from confidence interval, find the best point estimate of the population proportion p, confidence interval for standard deviation calculator, difference between point estimation and interval estimation, calculate confidence interval from standard error, point estimate calculator lower and upper bound, linear regression confidence interval formula, population confidence interval calculator, how to find point estimate of population proportion, population proportion sample size calculator, how to find 95 confidence interval in excel, how to find z value for confidence interval, confidence interval calculator population, how to find confidence interval without standard deviation, confidence interval for population variance calculator, population proportion confidence interval calculator, confidence interval estimate of the population mean, best point estimate of the population mean, how to calculate confidence interval without standard deviation, computing the point estimate of a population mean, confidence interval calculator for two means, confidence interval calculator for two sample proportions, point estimate of population proportion calculator, determine the point estimate of the population mean, calculate p value from confidence interval, confidence interval for difference in proportions calculator, determine the point estimate of the population proportion, confidence interval for population mean formula, how to find point estimate of population mean, confidence interval for population standard deviation calculator, confidence interval for variance calculator, find the critical value that should be used in constructing the confidence interval, how to find the upper and lower limits of a confidence interval in excel, how to find confidence interval for population mean, confidence interval for proportion formula, estimate population proportion calculator, how to calculate confidence interval excel, how to calculate confidence interval from standard error, how to calculate 95 confidence interval in r, how to calculate confidence interval for proportion, confidence interval for population proportion formula, the point estimate of the population proportion is, interval estimate of population mean with unknown variance, how to calculate prediction interval in excel, how to calculate confidence interval for slope in excel, find the margin of error for a 95 confidence interval, paired t test confidence interval calculator, in determining the sample size necessary to estimate a population proportion, confidence interval for the population standard deviation calculator, how to find confidence interval on calculator, how to calculate confidence level in excel, confidence interval for two proportions calculator, confidence interval for the difference between two proportions calculator, how to calculate p value from confidence interval, confidence interval estimate of the population mean calculator, normal distribution confidence interval calculator, calculate confidence interval without standard deviation, calculate margin of error from confidence interval, confidence interval sample size calculator, how to calculate a confidence interval in excel, 90 percent confidence interval calculator, calculate confidence interval from standard deviation, how to calculate 95 percent confidence interval, how to calculate standard deviation from confidence interval, determining sample size based on confidence and margin of error, how to find sample mean from confidence interval, point estimate for the population proportion p, find margin of error given confidence interval, estimating population proportion calculator, the point estimate of the population mean, regression confidence interval calculator, two proportion confidence interval calculator, interpreting interval estimate of a population proportion, how to calculate p value from confidence interval in excel, point estimate confidence interval calculator, find sample size given margin of error and confidence level, find the margin of error for the given values, estimating population mean sigma known calculator, interval estimation of the population mean, confidence interval for two means calculator, how to calculate margin of error from confidence interval, find a 95 confidence interval for the population mean, how to calculate a 95 confidence interval in excel, how to calculate confidence interval for odds ratio, how to find a confidence interval in excel, how to find sample size with margin of error and confidence level, confidence interval for difference in means formula, confidence interval for slope of regression line calculator, how to find critical value given confidence level, finding sample size with confidence interval, how to calculate population proportion in excel, how to calculate uncertainty at 95 confidence level, 95 confidence interval calculator proportion, statistics confidence interval calculator, confidence interval calculator with steps, how to compute confidence interval in excel, 99 percent confidence interval calculator, how do you calculate 95 confidence interval, how to calculate 95 confidence interval excel, effect size confidence interval calculator, how to get margin of error from confidence interval, how to calculate the confidence interval in excel, how to calculate confidence interval on calculator, confidence interval calculator for two dependent samples, how do you find the 95 confidence interval, find confidence interval for population mean, calculate confidence interval from p value, how to calculate confidence interval in minitab, t value for 90 confidence interval calculator, confidence interval calculator chi square, two sample t test confidence interval calculator, how to find z score for 95 confidence interval, upper and lower confidence interval calculator, confidence interval calculator without sample size, how to calculate confidence interval with standard error, how to find standard deviation for confidence interval, find sample size given confidence interval, how to calculate sample size given confidence level and margin of error, how to find z score for 90 confidence interval, how to calculate confidence interval for population mean, how to find sample size given confidence interval, calculate confidence interval for odds ratio, confidence interval for a mean calculator, critical value for 95 confidence interval calculator, p value calculator from confidence interval, p value from confidence interval calculator, critical value calculator with confidence level, finding margin of error with confidence interval, how to find sample size with confidence interval, confidence interval formula without standard deviation, how do you find the margin of error for a confidence interval, how to find upper and lower limits of confidence interval, calculate margin of error for confidence interval, confidence interval estimate of the population proportion, determine sample size for confidence interval, how to calculate standard deviation from 95 confidence intervals, calculate 95 confidence interval in excel, how to find the margin of error for a 95 confidence interval, confidence interval critical value calculator, confidence interval formula for population mean, calculate a 95 confidence interval for the mean, how to calculate confidence interval for mean, how to find minimum sample size with margin of error and confidence level, find sample mean from confidence interval, how to find critical value for 95 confidence interval, confidence interval calculator for the population mean, construct a 95 confidence interval calculator, confidence interval population variance calculator, calculate confidence level from sample size, interval estimate of population mean with known variance, point estimate of the population mean formula, 98 percent confidence interval calculator, how to find confidence interval with mean and standard deviation, large sample confidence interval calculator, prediction interval formula linear regression, how to calculate the 95 confidence interval in excel, how to find critical value with confidence level, how to calculate confidence interval from standard deviation, find the 95 confidence interval for the population mean, interval estimate of population proportion, you want to compute a 90 confidence interval, how to find point estimate for population mean, t critical value calculator with confidence level and sample size, computing the point estimate of a population mean example, estimating a population proportion calculator, how to find sample size needed for confidence interval, the point estimate of the population mean is, critical value confidence level calculator, finding confidence interval without standard deviation, small sample confidence interval calculator, finding sample size from confidence interval, how to find the width of a confidence interval, find the margin of error for the 95 confidence interval used to estimate the population proportion, how to calculate 95th percentile confidence interval, confidence interval upper and lower bound calculator, how to find critical value given confidence level and sample size, how to find z value from confidence interval, how do you find the margin of error from the lower and upper bounds of a confidence interval, how to find the sample mean from a confidence interval, how to find z score for 99 confidence interval, calculate z value for confidence interval, confidence interval margin of error formula, 95 confidence interval proportion calculator, calculate standard deviation from mean and confidence interval, critical value calculator with confidence level and sample size, find the point estimate of the population mean, how to calculate confidence interval by hand, how to calculate confidence interval in stata, how to find sample size for confidence interval, population proportion confidence interval formula, formula for confidence interval for population mean, how to calculate confidence interval formula, use confidence interval to find margin of error, confidence interval estimate of the mean calculator, confidence interval formula normal distribution, how to find confidence interval for proportion, how to find sample size with confidence interval and margin of error, sample size calculator with confidence interval, how to calculate confidence interval when standard deviation is unknown, confidence interval using t distribution calculator, how to calculate sample size with margin of error and confidence level, how to find confidence interval without sample size, how to find t value given confidence level and sample size, how to calculate point estimate of population mean, how to calculate prediction interval for multiple regression, how to determine confidence interval in excel, critical z value calculator confidence level, how to calculate sample size from confidence interval, how to determine confidence interval in a sample size, how to find confidence interval on minitab, how to find length of confidence interval with margin of error, calculate a 95 confidence interval for the population mean, estimating the difference between two population means, how to calculate upper and lower limits of confidence intervals, calculate sample size given margin of error and confidence level, calculate sample size with confidence interval and margin of error, you want to compute a 96 confidence interval, confidence interval calculator with two samples, point and interval estimation of population mean, find critical value given confidence level and sample size calculator, how to find confidence level in statistics, how to calculate 95 confidence interval for odds ratio, how to find a 95 percent confidence interval, point and interval estimation example problems, upper bound confidence interval calculator, point and interval estimation in statistics, confidence interval for two independent samples calculator, how to find z score given confidence interval, percentage confidence interval calculator, how to calculate confidence level from sample size, calculate 95 confidence interval calculator, confidence interval estimate for the population proportion, calculate sample size needed for confidence interval, how to calculate margin of error for a confidence interval, how to find standard deviation confidence interval, confidence interval to standard deviation calculator, how to find point estimate of the population proportion, how to calculate sample size given standard deviation and confidence interval, how to find the lower limit of a 95 confidence interval, find the critical value that corresponds to a 98 confidence level, construct the indicated confidence interval calculator, prediction interval calculator statistics, how to calculate confidence interval calculator, how to find 95 confidence interval for sample mean, how to calculate the confidence interval in r, how to calculate confidence interval for population proportion, calculate 95 confidence interval for regression coefficient, calculate the margin of error for a 95 confidence interval, confidence interval for a population mean calculator, confidence interval probability calculator, finding the confidence interval calculator, how to calculate standard deviation from mean and confidence interval, formula to calculate 95 confidence interval, lower bound of confidence interval calculator, confidence interval calculator for population variance, difference between point estimate and confidence interval, how to calculate mean from confidence interval, margin of error and confidence interval calculator, confidence interval calculator for 2 samples, calculate sample size from margin of error and confidence level, how to find t value for 95 confidence interval, how to determine confidence level in statistics, find the margin of error for a 90 confidence interval, how to calculate 95 confidence interval on excel, how to find the 95 percent confidence interval, how to calculate 95 percent confidence interval in excel, how to find 95 confidence interval calculator, how to determine a 95 confidence interval, how to calculate confidence interval from mean and standard deviation, confidence interval standard deviation formula, confidence interval for the difference of population means calculator, formula for 95 confidence interval for mean, how to calculate confidence interval without sample size, confidence interval lower and upper limit calculator, how to calculate confidence interval for chi square, how to find 95 confidence interval on excel, how to find the t score for a confidence interval, how to find the margin of error for a 99 confidence interval, confidence interval for population mean with unknown standard deviation calculator, confidence interval sample proportion calculator, how to find critical value for confidence level, find the best point estimate of the population mean, margin of error confidence level calculator, determine confidence level based on sample size, how to find the margin of error with a 95 confidence level, confidence interval degrees of freedom calculator, 95 confidence interval calculator for two samples, how to find 95 confidence interval for population mean, how to use excel to calculate confidence interval, confidence interval estimate for the population mean, construct a 95 confidence interval for the population mean calculator, how to calculate confidence level from confidence interval, how to calculate the margin of error for a sample proportion, find critical value for confidence interval, how to calculate confidence interval in statistics, 95 confidence interval formula calculator, how to calculate error bound confidence interval, confidence interval calculator for difference in proportions, point estimate of the population mean example, confidence interval calculator for population, point estimate of the population mean and margin of error for the confidence interval, estimating population proportion for large sample size, calculate confidence interval for a proportion, confidence interval calculator with mean and standard deviation, formula for confidence interval t distribution, how to find the confidence level in statistics, how to calculate confidence interval with margin of error, construct 95 confidence interval calculator, point estimate calculator for population mean, how to calculate confidence interval in excel 2016, calculate confidence limits for a sample proportion, formula for confidence interval for population proportion, confidence interval population mean formula, margin of error t distribution calculator, statistical estimation of confidence intervals, estimate the population mean with 95 confidence, how to find confidence interval between two means, t distribution formula confidence interval, confidence interval calculator for population standard deviation, construct a 99 confidence interval for the population proportion calculator, how to calculate confidence interval in calculator, how to calculate confidence interval for small sample size, how to find 95 confidence interval with mean and standard deviation, how to find the point estimate of a population mean, use the confidence level and sample data to find the margin of error e, calculate p value from 95 confidence interval, how to calculate 95 confidence interval formula, how to calculate confidence interval for difference in proportions, how to calculate confidence interval given mean and standard deviation, calculate standard deviation 95 confidence interval, how to calculate confidence level in statistics, point estimate calculator with upper and lower bounds, 95 confidence interval for population proportion calculator, confidence interval estimate for the proportion, how to calculate a confidence interval for a population mean, formula for 95 percent confidence interval, sample mean calculator confidence interval, sample size and confidence interval calculator, formula for interval estimate of population mean, simple random sample confidence interval calculator, 95 confidence interval estimate calculator, confidence interval calculator statistics, confidence interval estimation of the population mean, how to calculate sample size with 95 confidence interval, how to construct 95 confidence interval in excel, how to find confidence interval for variance, population proportion margin of error calculator, sample size calculator proportion confidence interval, construct a 99 confidence interval calculator, how to calculate upper and lower 95 confidence intervals, sample size calculator confidence interval margin of error, calculate confidence interval normal distribution, how to calculate confidence limits in excel, two population proportion confidence interval calculator, estimating the population proportion calculator, how to calculate z score confidence interval, interval estimation and confidence interval are, margin of error formula with confidence interval, confidence interval to find margin of error and sample mean calculator, find sample size given confidence interval calculator, confidence interval formula population mean, finding critical value with confidence level, formula for point estimate of the population mean, confidence interval formula for two samples, confidence interval calculator for two independent samples, how to determine the 95 confidence interval.