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you decide to take a course to help prepare you for the GRE (graduate record exam.) There are two courses for you to take both

you decide to take a course to help prepare you for the GRE (graduate record exam.) There are two courses for you to take both provide average scores for students who complete the course.

Course A: Mean =700

Course B: Mean= 680

before deciding on which to take what are two other pieces of statistical data, you need to know, in order to put these performance indices into context?

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