Do sat coaching classes work? do they 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).  student      12  34first sat score920830960910second sat score10108001000980for a two-sample t test using these data, what is the approximate value of the test statistic t?