In an effort to improve the mathematical skills of 10 students, a teacher provides a weekly 1-hour tutoring session for the students. A pretest is given before the sessions and a posttest is given after the sessions. The results are shown below. At alpha equal to 0.01, can it be concluded that the sessions help to improve the students\' mathematical skills?

Pretest	Posttest
83	89
77	80
94	97
61	82
84	80
69	72
70	75
66	79
82	86
86	94