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A psychologist conducts a survey of students to determine whether juniors' and seniors' scores differ on a statistics exam (scored on a 0 to 100

A psychologist conducts a survey of students to determine whether juniors' and seniors' scores differ on a statistics exam (scored on a 0 to 100 scale). To do so, she collected scores for a sample of juniors and a sample of seniors. Which statistical test should she use to test her

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