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 Posttest 76 83 80 82 T g s g T e " W % Copy Data Step 2 of 2 Interpret the confidence interval obtained in Step 1. Alivwen HH 1diC> B mEYpRau Keyboard Shortcuts o since the confidence interval contains zero, the data do not provide evidence of a significant increase in students' scores using the professor's teaching method at a 95% confidence level. o wWe are 95% confident that the mean increase in students' scores from the pretest to the posttest is between 0.5 and 14.1 points for the population of students in this professor's class. o Since the confidence interval does not contain zero, the data do not provide evidence of a significant increase in students' scores using the professor's teaching method at a 95 % confidence level, We are 95% confident that the mean decrease in students' scores from the pretest to the posttest is between 0.5 and 14.1 points for the population of students in this professor's class. o