1. Suppose I found a positive correlation between GPA and the number of hours spent studying for a sample of PSU students. The least-square regression line of GPA on number of hours spent studying have

(a) a positive slope

(b) a negative slope

(c) could be a negative slope or a positive slope, we can't be sure.

2. Suppose that you have two variables X and Y with a correlation of 0.7. What is the coefficient of determination of the least square regression line of Y on X.

3. Consider the same example as in 2. What can you say about the coefficient of determination of the least square regression line of X on Y?