1. A survey asks participants to express their opinions using a 1-7 point scale 1 = "strongly agree" 4 = "neither agree nor disagree" 7 = "strongly disagree" If we hypothesize that there will be no strong preferences in the population then our null hypothesis would be?

2. "Optimism" test is administered to two classes of college seniors Last year: = 15 This year: n = 9, M = 10, SS = 94 Based on the sample data, can we conclude that this year's class has a different level of optimism than last year's class? Conduct a t-test and make a conclusion