Statistics Dictionary

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Decision Rule

A decision rule is a procedure that the researcher uses to decide whether to accept or reject the null hypothesis .

For example, a researcher might hypothesize that a population mean is equal to 10. He/she might collect a random sample of observations to test this hypothesis. The decision rule might be to accept the hypothesis if the sample mean were close to 10 (say, between 9 and 11), and to reject the hypothesis if the sample mean were not close to 10 (say, less than 9 or greater than 11).

See also:   Statistics Tutorial: Hypothesis Tests