SAT Prep Can special study courses actually help raiseSAT scores? One organization says that the 30 studentsthey tutored achieved an average gain of 60 points whenthey retook the test.a) Explain why this does not necessarily prove that thespecial course caused the scores to go up.b) Propose a design for an experiment that could test theeffectiveness of the tutorial course.c) Suppose you suspect that the tutorial course might be morehelpful for students whose initial scores were particularlylow. How would this affect your proposed design?

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