Do SAT coaching classes work? Do they help students to improve their test scores? Four students were selected randomly from all of the students that completed an SAT coaching class. For each student, we recorded their first SAT score (before the class) and their second SAT score (after the coaching class). First SAT score Second SAT score To analyze these data, we should use the: O A. one-sample t test. O B. matched pairs t test. Student 1 2 4 920 830 960 910 1010 800 1000 980 O C. two-sample t test. O D. Any of the above is valid. It just needs to use the t distribution because a is unknown