Confidence Interval Calculators

Confidence Interval for mean Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Population Mean (Z-Distribution) Use this calculator for confidence intervals when population standard deviation is known (rare scenario,...

Confidence Interval for mean t Calculator

Feb 10, 2026
STATISTICS

Confidence Interval For Mean (T-Distribution) Use this calculator to compute the confidence interval for population mean when the population standard...

Confidence Interval for means t equal variances Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Difference of Two Means (Equal Variances) Use this calculator for the confidence interval of the difference between...

Confidence Interval for means t unequal variances Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Difference of Two Means (Unequal Variances - Welch’s Method) Use this calculator for confidence intervals when comparing...

Confidence Interval for means z Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Difference of Two Means (Z-Distribution) Use this calculator to estimate the confidence interval for the difference between...

Confidence Interval for paired t-test Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Paired Differences (Dependent Samples) Use this calculator for confidence intervals when comparing two related/matched samples (before-after studies,...

Confidence Interval For Population Variance Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Population Variance Use this calculator to estimate the confidence interval for population variance - a measure of...

Confidence Interval for proportion Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Single Proportion Use this calculator to compute the confidence interval for population proportion when you have binary...

Confidence Interval for proportions Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Difference Between Two Proportions Use this calculator for confidence intervals comparing two population proportions (e.g., success rates...

Confidence Interval for ratio of variances Calculator

Feb 10, 2026
STATISTICS

Confidence Interval for Ratio of Two Variances (F-Distribution) Use this calculator for confidence intervals comparing population variability/consistency between two groups...

Plus Four Confidence Interval for proportion Calculator

Feb 10, 2026
STATISTICS

Plus-Four Confidence Interval for Single Proportion Use this calculator for confidence intervals when sample size is small or proportion is...

Plus Four Confidence Interval for proportions Calculator

Feb 10, 2026
STATISTICS

Plus-Four Confidence Interval for Difference Between Two Proportions Use this calculator for confidence intervals comparing two proportions when sample sizes...