Central America has countries.
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Music the height of a wave or the amount of the wave carries is the amplitude. a. air b. nodes c. speed d. energy

Is when a person has given their consent based on understanding the actions and facts of a study?

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