Question: An educator designed a reasoning skills course. 9 students were selected and given a pretest to then determine their reasoning abilities. After completing the course, the same students were given an equivalent form of the test to see whether their reasoning skills had improved. The data are shown here. Significance level=0.05, did the course improve their reasoning skills?

Student 1 2 3 4 5 6 7 8 9

Pretest 80 76 74 83 92 78 91 74 88

Posttest 82 78 73 85 95 79 93 78 90