Question: 427 Do SAT coaching classes work? Do they help students to improve their test scores? Four students were selected randomly from all of the students

427 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). Student 2 3 First SAT score 920 830 960 910 Second SAT score 1010 800 1000 980
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