Question 8 of 10, Step 1 of 2 13/20 Correct To determine if his teaching method increases students' learning, a professor administers a pretest to his class at the beginning of the semester and then a posttest at the end of the semester. The results from 10 randomly chosen students are given below. Let Population 1 be the Pretest scores and Population 2 be the Posttest scores. Test Scores Pretest 76 65 54 61 72 68 88 58 51 79 Posttest 78 65 57 92 84 78 90 51 64 90 Step 1 of 2: Construct a 90 % confidence interval for the true mean difference between the scores to determine if the teaching method increases students' knowledge of the course material. Round the endpoints of the interval to one decimal place, if necessary.