1. In a study of proctored and non-proctored tests in an Intermediate Algebra course, researchers obtained the data for the test results given below. Use a .05 significance level to test the claim that students taking non-proctored tests get a higher mean than those taking proctored tests.

Nonproctored: n = 32, x= 89, s= 22.09

Proctored: n = 38, x= 74.5, s= 12.87

2. A SRS of 130 ULL students found that 33 of them say they are working for an associate's degree. A different SRS of 85 ULL students found that 50 of them say they are working towards a bachelor's degree. Find a 90% confidence interval for the difference in the proportions.