A researcher expects a treatment to increase the scores for individuals in a population.The treatment is evaluated using a one-tailed hypothesis test,and the test produces z = +2.40.Based on this result,what is the correct statistical decision? 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

A z-score of +2.40 is significant for both α = .05 (critical value approximately 1.645) and α = .01 (critical value approximately 2.33) in a one-tailed test.

A Researcher Expects a Treatment to Increase the Scores for Individuals