the rejection region for the null hypothesis in the testing of a hypothesis.
Origin of critical region
First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
that part of a statistical distribution in which the probability of a given hypothesis is less than the chosen significance level, so that the hypothesis would be rejected
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012