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A school administrator believes that taking an online prep course prior to enrollment in a math...

A school administrator believes that taking an online prep course prior to enrollment in a math course will improve your overall course grade. Suppose that the average course grade is 621 points (out of 800 possible) with a standard deviation of 32 points. A sample of 30 students who took the prep course had a mean course grade of 618 points. At the 6% significance level, is there enough evidence to suggest that taking the prep course really does improve your overall course grade?

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