Dr Afzal Finds That Students Who Work Less Than 10

Multiple Choice

Dr. Afzal finds that students who work less than 10 hours a week have significantly higher test scores than students who work more than 10 hours a week. In order to determine the magnitude of the effect of work hours on test scores, he should calculate an estimate of the _____.

A) critical value
B) effect size
C) null effect
D) halo effect