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

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In a one-tailed test where the expectation is an increase in scores, the critical region would consist of z-scores greater than +1.65, not less than -1.65, because the interest is in detecting an improvement (higher scores).

A Researcher Is Evaluating a Treatment That Is Expected to Increase