PJ conducts an experimental study on the effects of soft music during high stakes science testing

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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 (Randomized posttest only control group design

b.Randomized Pretest-posttest control group design

c.Control-group-time-series design

d.Nonrandomized control-group pretest-posttest design