You ask your friend to loan you $2,000 for the down payment on a new car. he agrees only if he is repaid in six months and your father agrees to pay him back if you fail to do so. does this arrangement have to be in writing to be enforceable?

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