Do not reject null hypothesis Bewildering Things Statisticians Say: Failure to Reject the Null Hypothesis

Do not reject null hypothesis, how do we fail to reject the null hypothesis?

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Advice concerning the use of one-tailed hypotheses has been inconsistent and accepted practice varies among fields. Fisher published the first edition of Statistical Methods for Research Workers which defined the statistical significance test and made it a mainstream method of analysis for much of experimental science.

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The mean exam mark for the "seminar" and "lecture-only" teaching methods is the same in the population. A potential null hypothesis implying a one-tail test is "this coin is not biased toward heads".

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Pure arguments over the use of one-tailed tests are complicated by the variety of tests.