How were national laws enforced under the articles of confederation a: the states decided wether or not to follow them
b:the executive branch made people follow them
c: the national army enforced them
d: the leader of the government enforced them

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