Question: Below are students' SAT scores before and after taking prep course: Before: 1200, 1190, 890, 1380, 1280, 1170, 1170, 1090, 890 After: 1300, 1090, 1090,

Below are students' SAT scores before and after taking prep course:

Before: 1200, 1190, 890, 1380, 1280, 1170, 1170, 1090, 890

After: 1300, 1090, 1090, 1500, 1340, 1500, 1200, 1180, 1090

at = 0.01, test the claim that the mean difference of scores is below zero, meaning that the course improves SAT scores.

A) use a confidence interval

B) Use a hypothesis test

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