A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.37.If the researcher is using a one-tailed test,what is the correct statistical decision?
A)Reject the null hypothesis with α = .05 but not with α = .01.
B)Reject the null hypothesis with either α = .05 or α = .01.
C)Fail to reject the null hypothesis with either α = .05 or α = .01.
D)This cannot be answered without additional information.

Question

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.The hypothesis test produces a z-score of z = 2.37.If the researcher is using a one-tailed test,what is the correct statistical decision?​
A)​Reject the null hypothesis with α = .05 but not with α = .01.
B)​Reject the null hypothesis with either α = .05 or α = .01.
C)​Fail to reject the null hypothesis with either α = .05 or α = .01.
D)​This cannot be answered without additional information.

Quizplus · Accepted Answer

A z-score of 2.37 exceeds the critical value for a one-tailed test at both α = .05 (z = 1.645) and α = .01 (z = 2.33), so the null hypothesis is rejected at both significance levels.

A Researcher Conducts a Hypothesis Test to Evaluate the Effect