Question: 5. Decide whether to reject the null hypothesis. A Z score of 2 is more extreme than the cutoff Z of 1.96. Reject the null

5. Decide whether to reject the null hypothesis. A Z score of 2 is more extreme than the cutoff Z of ±1.96. Reject the null hypothesis; the result is significant. The evidence supports the conclusion that the experimental treatment affects scores on this measure. The diagram is shown in Figure 5–6.

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