19. A school psychologist notes that the average number of times that students are disruptive during class is 1.4 (u = 1.4) times per day. Following recent classroom policy changes, the psychologist tests if the number of disruptions during class has changed. He records the following number of disruptions observed during a class day: 2, 4, 3, 5, 4, 1, 1, and 4. 474 1. Test the hypothesis that the number of complaints has increased or decreased using a .05 level of significance. State the value for the test statistic and the decision to retain or reject the null hypothesis. 2. Compute effect size using estimated Cohen's d