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8/20 Question S of 10, Step 1 of 2 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 | be the Pretest scores and Population 2 be the Posttest scores. Test Scores Pretest Posttest 83 71 73 72 82 81 81 57 97 88 57 56 53 51 68 59 57 60 90 84 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