Disability Services introduced a new mentorship program to help students with disabilities achieve better scholastic results. Test grades were recorded for 23 students before and after the program was introduced. The average difference in test score (after - before) was -0.5 with a standard deviation of 2.47. Construct a 99% confidence interval for the true average difference in test scores.

Question 9 options:

1)

(-3.32, 2.32)

2)

(-1.95, 0.95)

3)

(-1.02, 0.02)

4)

(1.95, 0.95)

5)

(-1.95, 0.95)