Glossary

Every term, in one place

The same 1 definitions the lessons link to inline, wherever a sentence uses them — gathered here so a definition is never more than one page away.

E

extrapolation: Extending a line of best fit or a trend beyond the range of the data it was actually drawn from, to forecast a value outside that range. Reliability depends entirely on the assumption that the relationship observed within the data continues to hold beyond it — an assumption, not a calculated fact.