Default assumption, no effect observed.

Evaluating assumptions using statistical methods.

Proposed explanation differing from null.

A hypothesis that is weakly held, tentatively, as a best guess; such a hypothesis among several plausible ones that is driving or underpinning a scientific team's work at a given time.

Statistical method evaluating evidence strength.

(economics) The proposition that a long-term interest rate is determined purely by current and future expected short-term rates, so that the expected final value of wealth from investing in a sequence of short-term bonds equals the final value of wealth from investing in long-term bonds.

Assumption for proof by induction.

Earth functions as a single organism.