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. One concern in his study is that during the year the music teacher at the school he administered the study shared with students the physiological benefits of soft music.
-PJ's design is best represented by which of the following?
A) Static-group comparison
B) Pretest-posttest control group design
C) One-shot case study
D) One-group pretest-posttest design

Question

Quizplus · Accepted Answer

The design best fits the pretest-posttest control group design, where one group is exposed to the independent variable (music) while the other is not. A pretest is conducted before the experiment, and a posttest is conducted after the experiment to assess the effect of the independent variable on the dependent variable (test scores). The control group is a baseline for comparison to the experimental group, and helps control for extraneous variables.

PJ Conducts an Experimental Study on the Effects of Soft