Jeffery Wanted to Make Sure That the Preexisting Condition of Motivation

Multiple Choice

Jeffery wanted to make sure that the preexisting condition of motivation would not affect his experiment on the effects of study skills on grades. He should:

A) allow the subjects to volunteer to be in the experimental and control groups
B) use personality tests to place subjects in the experimental and control groups
C) use random assignment of subjects to the experimental and control groups
D) teach both groups study skills and see which group actually utilized the skills