A researcher is evaluating a treatment that is expected to increase scores.If a one-tailed test with $\alpha$ = .05 is used, then the critical region consists of z-scores greater than 1.65.

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For a one-tailed test with $\alpha$ = .05, the critical region is in the upper tail, and the critical z-score is approximately 1.645, which is often rounded to 1.65.

A Researcher Is Evaluating a Treatment That Is Expected to Increase