Question: In an effort to improve the mathematical skills of 10 students, a teacher provides a weekly one-hour tutoring session for the students. A pretest is given before the session, and a posttest is given after. The results are shown here. At a = 0.01, can it be concluded that the sessions help to improve the students' mathematical skills?

Students 1 2 3 4 5 6 7 8 9 10

Pretest 82 76 91 62 81 67 71 69 80 85

Posttest 88 80 98 80 80 73 74 78 85 93