In Order to Determine Whether or Not a Special Tutoring $\alpha$

Essay

In order to determine whether or not a special tutoring service improves the scores of students in a Business Statistics examination, a sample of 6 students were given the exam before and after using the tutorial service. The results are shown below.
Let d = Score After - Score Before.

At $\alpha$ = 0.10, test to see if the tutorial service actually increased scores on the examination.