A decision rule is a procedure that the researcher uses to decide whether to accept or reject the null hypothesis.
The procedure for hypothesis testing is based on the upper, lower and two-tailed test.
It consists of 5 steps
H0: Null hypothesis
H1: Alternative hypothesis ; α =0.05
An example of a test statistic is the Z statistic computed as follows:
The decision rule is a statement that tells under what circumstances to reject the null hypothesis. The decision rule is based on specific values of the test statistic (e.g., reject H0 if Z >1.645 upper tailed test).
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