Statistical Inference Calculators

Draw conclusions from samples: confidence intervals and margins of error, sample sizes for surveys, correlation and regression for paired data, and ANOVA and chi-square tests with p-values and critical values.

Confidence Interval Calculator

Confidence intervals for a mean or proportion.

Margin of Error Calculator

Margin of error for surveys and polls.

Sample Size Calculator

How many responses you need.

Correlation Calculator

Pearson r, r², p-value and Spearman.

Linear Regression Calculator

Line of best fit, R² and predictions.

ANOVA Calculator

One-way ANOVA for 2 to 5 groups.

Chi-Square Calculator

Chi-square independence and goodness-of-fit tests.