A researcher wants to test the research hypothesis that the mean rating of guilt will be higher for unattractive defendants than for attractive defendants.The appropriate statistical test would be the
A) Pearson r.
B) 2-tailed t-test.
C) 1 tailed t-test.
D) chi-square.

Question

Quizplus · Accepted Answer

A 1-tailed t-test would be appropriate to test this research hypothesis as the researcher has a directional hypothesis (i.e., that the mean rating of guilt will be higher for unattractive defendants) and wants to determine if there is a significant difference in guilt ratings between the two groups. Other options (Pearson r, chi-square) are not appropriate for testing this type of hypothesis, and a 2-tailed t-test would not be as powerful as a 1-tailed t-test in this case.

A Researcher Wants to Test the Research Hypothesis That the Mean