PJ conducts an experimental study on the effects of soft music during high stakes science testing.He randomly assigns students at the school.In one condition he does not provide music for testing while in the other group he does provide the music.He administers a pretest at the beginning of the year and a posttest at the end of the year.PJ's design is best described as a:
A)Static group comparison
B)Pretest-posttest control group design
C)Control-group-time-series design
D)Nonrandomized control-group pretest-posttest design

Question

Quizplus · Accepted Answer

This is a pretest-posttest control group design because PJ has randomly assigned students to a group with and without music during testing and has administered a pretest before the experiment and a posttest after the experiment. This design allows for a comparison of the effects of the music intervention on the posttest scores while controlling for initial differences between the groups on the pretest.

PJ Conducts an Experimental Study on the Effects of Soft