Use the = 0.05 level of significance to test the effectiveness of reading course based on the following data of reading test scores from 9 students taken both before and after they took the course.

Before: 71, 78, 82, 76, 79, 64, 88, 80, 82. After: 77, 84, 90, 77, 82, 68, 90, 79, 89

Differences: 6, 6, 8, 1, 3, 4, 2, -1, 7