null hypothesis

/N AH1 L AY0 P AA0 TH AH0 S AH0 S/
noun
  1. 1

    A hypothesis set up to be nullified or refuted in order to support an alternative hypothesis. When used, the null hypothesis is presumed true until statistical evidence in the form of a hypothesis test indicates otherwise. Therefore, the null and the alternative hypothesis must be mutually exclusive and exhaustive.

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Source: https://en.wiktionary.org/wiki/null%20hypothesis