Dr Allen Forms the Hypothesis That Students Will Score Higher

Multiple Choice

Dr. Allen forms the hypothesis that students will score higher on take-home exams than they will on in-class exams. In this experiment, what is the best way to divide the participants into groups?

A) Have the participants choose which type of exam they want to take.
B) How the groups are formed doesn't matter.
C) Have all males in one group and all females in the other.
D) Use random assignment.