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 from10 randomly chosen students are given below. Let Population 1 be the Pretest scores and Population 2 be the Posttest scores.

Pretest	Posttest
78	94
56	58
89	87
59	89
58	68
79	84
54	66
83	96
71	69
79	81

Step1of2:

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.

Lower endpoint:

Upper endpoint: