- JU PUIIILJ IV Many states mandate tests that have to be passed in order for the students to graduate with a high school diploma. A local school superintendent believes that after-school tutoring will improve the scores of students in his district on the state's graduation test. As atrial ru n, a tutor agrees to work with 15 students for a month. The superintendent ask the school board to implement this after-school tutoring program if there is evidence that students scores would increase by an average of more than 20 points. The superintendent will test a hypothesis. The table shows the increase in scores by the 15 students in the program. State an appropriate conclusion