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

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A one-tailed test with a = .05 would have a critical region in the upper tail of the distribution, consisting of z-scores greater than 1.65. This is because the researcher is only interested in evaluating whether the treatment increases scores, and is not concerned with the possibility of a decrease in scores.

A Researcher Is Evaluating a Treatment That Is Expected to Increase