Jan and marsha were the co-captains of their high school’s small environmental action club, and now that they are at college, they have joined a large club with a similar mission. however, danni has noticed that michelle’s behavior changed once they joined up with a larger group of students. once a passionate and tireless worker, michelle now seems content to sit back and let others do the work. which of the following terms seems to describe the change in michelle’s behavior?

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 comparisonb. pretest-posttest control group designc.control-group-time-series designd. nonrandomized control-group pretest-posttest design