Four-year-old tommy notices that every time his baby brother cries, his mother picks him up and holds him. tommy quickly learns that if he also cries he will get his mother to pay attention to him. his behavior resembles the choices made in the bobo doll experiments in the sense that his baby brother's behavior is and therefore tommy is more likely to it.

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