Statistics calculators for data summaries, probability, and inference

The statistics collection supports the path from raw observations to an interpretable result. Calculate descriptive measures, probability and distributions, confidence intervals, sample sizes, hypothesis tests, correlation and regression, effect sizes, and diagnostic or quality metrics.

Choose the method before looking at the answer. Check whether observations are independent, whether the data type and distribution fit the test, and whether the input represents a sample or a full population. Report the estimate and uncertainty together; a p-value or headline score alone is rarely enough.