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Renado owns an ACT Prep company. He believes that students who take his prep course will score differently on the ACT than the national average,

Renado owns an ACT Prep company. He believes that students who take his prep course will score differently on the ACT than the national average, which is 21 (m = 21). He randomly selects a sample of 25 (N = 25) of his prep course graduates and finds their mean ACT score.

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