the.com/null hypothesis

means The null hypothesis is the baseline assumption — usually that there's no effect, no difference, no relationship — which a statistical test tries to find evidence against.

from 'Null' traces to Latin nullus, 'none,' and entered statistical vocabulary in the early 20th century as researchers formalized hypothesis testing — most notably through the work of statistician Ronald Fisher, who framed experiments around a hypothesis of 'no difference' that the data could either knock down or fail to knock down. The word 'hypothesis' itself comes from Greek hypotithenai, 'to put under' or 'suppose,' the idea being something set beneath an argument as its tentative foundation.