A hypothesis which states that the experimental group mean will be higher than the control group mean should:
A) not use a test of statistical significance
B) use a one-tailed test of statistical significance
C) use a two-tailed test of statistical significance
D) use a Chi-Square test

Question

Quizplus · Accepted Answer

A one-tailed test of statistical significance is appropriate when the hypothesis predicts a specific direction of difference (e.g., the experimental group mean will be higher than the control group mean), as it tests for the probability of the observed data under the hypothesis in one direction only.

A Hypothesis Which States That the Experimental Group Mean Will