A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population.If the researcher uses a one-tailed test with α = .01,then which of the following correctly identifies the critical region? A)z 2.33 B)z 2.58 C)z

Question

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population.If the researcher uses a one-tailed test with α = .01,then which of the following correctly identifies the critical region? A)z > 2.33 B)z > 2.58 C)z < 2.33 D)z < 2.58

Quizplus · Accepted Answer

For a one-tailed test with α = .01, the critical region is in the tail of the distribution where the extreme values lie. Since the treatment is expected to increase scores, the researcher is looking at the upper tail. The z-score that corresponds to a .01 level of significance in the upper tail is 2.33, thus z > 2.33 is the correct critical region.

A Researcher Is Conducting an Experiment to Evaluate a Treatment