What is the common purpose of the ninth and tenth amendments?

a. they protect the rights of noncitizens.
b. they protect rights not listed in the constitution.
c. they protect the federalist system.
d. they protect the federal government from the states.

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