null hypothesis
Statistical term; the hypothesis that there is no significant difference or effect, tested against an alternative hypothesis (対立仮説).
See also: 対立仮説
If the null hypothesis is rejected, the alternative hypothesis is adopted.
In this study, the null hypothesis was set as 'there is no difference between the two groups'.
The alternative hypothesis, which is accepted when the null hypothesis is rejected.
Compound of 帰無 (return to nothing) and 仮説 (hypothesis), a calque of English 'null hypothesis'.