2. A study is being done on the change in anxiety that occurs throughout a graduate statistics class. A group of 20 students were administered an anxiety score before the first lesson of their class and right after the last unit. Higher scores indicate greater anxiety. Using the data below, test the hypothesis that there is no difference in anxiety scores. 2 10 11 12 AWN 13 14 15 6 N 17 IN 18 19 20 6