See every step.

Before you copy an answer

Check the data count, sample versus population wording, required decimals and quartile convention. Round once at the end. Summary numbers are not a raw dataset. Grouped midpoints give an estimate.

r² is the coefficient of determination. It describes variation explained by a fitted line with an intercept; it does not give the direction or prove cause.

Physical calculator steps were checked against TI documentation. This page has not been tested on physical calculators or in live Excel. Button labels can vary by version.