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

Question

Quizplus · Accepted Answer

A z-score of +2.40 is significant at both the .05 and .01 alpha levels for a one-tailed test, indicating that the null hypothesis should be rejected in favor of the alternative hypothesis that the treatment increases scores.

A Researcher Expects a Treatment to Increase the Scores for Individuals