A school counselor wants to compare the effectiveness of an online SAT preparation program with an in-person SAT preparation class. For an experiment, the counselor recruits 30 students who have already taken the SAT once. The response variable will be the improvement in SAT score. a. Design an experiment that uses a completely randomized design to investigate this question. b. Design an experiment that uses a matched pairs design to investigate this question. Explain your method of pairing. c. Which design do you prefer