A researcher conducts a hypothesis test to evaluate the effect of a treatment.The hypothesis test produces a z-score of z = 2.37.Assuming that the researcher is using a two-tailed test, what decision should be made? A)The researcher should reject the null hypothesis with α = .05 but not with α = .01. B)The researcher should reject the null hypothesis with either α = .05 or α = .01. C)The researcher should fail to reject H₀ with either α = .05 or α = .01. D)Cannot answer without additional information.

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Quizplus · Accepted Answer

The critical z-values for a two-tailed test are approximately ±1.96 for α = .05 and ±2.58 for α = .01. A z-score of 2.37 falls beyond the critical value for α = .05 but not for α = .01, so the null hypothesis should be rejected at α = .05 but not at α = .01.

A Researcher Conducts a Hypothesis Test to Evaluate the Effect