Khalad Is Conducting a Study to Determine If Motivational Posters

Multiple Choice

Khalad is conducting a study to determine if motivational posters inspire middle school students to be more pro-social and to complete more homework. He goes to a large school district to conduct his study. In one of the district's middle schools he puts the posters up and in the second school he does not. After the posters are up for two months he compares the GPA and number of disciplinary referrals between the two schools. Which of the following designs is most representative of Khalad's study?

A) 2 x 2 factorial design
B) Posttest-only design with nonequivalent groups
C) Posttest only control group design
D) Solomon four group design