WordReference Random House Unabridged Dictionary of American English © 2025
null′ hypoth′esis, 
  1. Statistics(in the statistical testing of a hypothesis) the hypothesis to be tested. Cf. alternative hypothesis. 
  • 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::
null hypothesis
  1. the residual hypothesis if the alternative hypothesis tested against it fails to achieve a predetermined significance level
'null hypothesis' also found in these entries (note: many are not synonyms or translations):
Type I error - Type II error - acceptance region - alternative hypothesis - critical region - power - rejection region - significance level

Forum discussions with the word(s) "null hypothesis" in the title:


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