1. A group of research wants to understand how a writing program changes students' scores on a writing concepts exam. They test the students before and after the writing program. Compute the dependent t-test for the following data: Pre Post D D - D (D - D)2 30 40 21 34 23 30 25 26 26 26 27 29 28 39 34 30 27 29 26 24 21 40 30 31 35 40 23 21 D SSp Sp t of