Iam trying to train my dog fido to sit. every time he sits, i give him a dog cookie. before i can get the behavior perfectly every time, fido wanders off and jumps in the nearby lake. one explanation for fido's behavior could be

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