A study is designed to test the effectiveness of a program to teach adolescents about nutrition. All research participants are randomly assigned to two groups, one which goes through the program and the other which does not. Both before and after the program, all participants take a test measuring knowledge of nutrition. What type of experimental design is this?
A) posttest-only control group design
B) pretest-posttest control group design
C) 2 × 2 factorial design
D) 2 × 4 factorial design

Question

Quizplus · Accepted Answer

This is a pretest-posttest control group design because all participants are randomly assigned to two groups, one which goes through the program and the other which does not, and both before and after the program, all participants take a test measuring knowledge of nutrition.

A Study Is Designed to Test the Effectiveness of a Program