he teacher from Problem 21 also tried a different ap- roach to determining whether changing answers helps r hurts exam grades. In another class, students were old to review their final exams and change any answers they wanted to before turning them in. However, the students had to indicate both the original answer and the changed answer for each question. The teacher graded cach exam twice, once using the set of original answers and once with the changes. In the class of n = 22 stu- dents, the exam scores improved by an average 0l Mp = 2.5 points with the changed answers. The standard D. deviation for tho dif

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