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A professor wants to conduct a study regarding student prerequisite knowledge for College Algebra. She studies the placement test scores and is told that the

A professor wants to conduct a study regarding student prerequisite knowledge for College Algebra. She studies the placement test scores and is told that the population standard deviation is 6.72 How many students would she need for her study if she wants to build a 95% confidence interval with a margin of error of 2 points?

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