Jefferson davis would likely point to as justification for the confederacy's secession from the union. a. the war of 1812b)the american revolutionc)the treaty of guadalupe-hidalgod)the "necessary and proper" clause of the u. s. constitution

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