1. What is the equation for a residual, e_i?

2. What do we know about the sum of residuals when we use a least-squares regression line?

3. What do we know about the sum of squared residuals from a least-squares regression line?

4. In words, what are a, b, and r?

5. In words, what are S_x, S_y and S_xy?

6. If we know S_x = 10, S_y = 20 and S_xy = 6, then what is b? What is r?

7. (new problem) If we know S_x = 8, S_y = 4 and r =.6, then what is b?

When you are finished, check your answers.