How do I go about answering this question (setting up the equations and finding the crtiical value)?

1.VT is interested in the effectiveness of teacher training classes on the quality of instruction in discussion sections. The administrators have decided to use a study with a matched, experimental design to explore this problem. Thirty GTAs took an intensive teacher-training class before the Fall '18 semester began and they were paired with graduate students teaching the same courses who did not take the intensive training class. Course evaluations were compared at the end of the semester, and the mean advantage for GTAs who took the course compared to their matched counterparts was 1 point on ratings of the question "The instructor is an excellent teacher." The standard deviation of this difference was 2.5.

Do teacher training classes improve GTA evaluations? Use a 1% significance level. Show your work for all 4 steps in hypothesis testing. State in words what the conclusion you reach from the hypothesis test suggests about the answer to the italicized question.