Wolfram|Alpha has confidence interval calculators. Solve problems related to the Agresti–Coull, standard, Clopper–Pearson, Jeffreys, plus‐four or Wilson score confidence interval for a binomial parameter; the simple T‐interval or T‐interval for the difference between two means; the confidence interval for the difference between two population means; the confidence or plus‐four confidence interval for the difference between two binomial parameters; the confidence interval for the standard deviation of a normal population; the T‐interval or Z‐interval for a population mean; the confidence interval for the variance of a normal population; and the Wilson score confidence interval for a binomial parameter with continuity correction.
