1. In 2005, the average GPA for students was 3.15. A sample in 2008 showed that the average GPA for students was 3.46. An alternative hypothesis for GPA of students is:
A. The mean GPA is more than 3.15 and less than 3.46
B. The mean GPA is less than 3.46
C. The mean GPA has increased to more than 3.15
D. None of the above
2. The correlation between two variables is +0.8 for a sample of 10 observations. We wish to show there is a positive relationship between the two variables. Which of the following is a correct statement of the null hypothesis and the alternate hypothesis (H0 = null hypothesis and Ha = alternative hypothesis)?
A. H0: p = 0, HA: p > 0
B. H0: p = 0, HA: p is not equal to 0
C. H0: p = 0, HA: p < 0
D. Depends on the level of significance
3. The following results were obtained as part of a simple linear regression analysis. The regression equation is Y = 37.28-1.22X. For each unit change in X, the change in Y is
A. -1.22
B. 0.78
C. 37.28
D. 38.50
E. none of the above