9. The prediction equation for a sample of 100 people relating X = years of education and Y = annual income (in dollars; is = -6000 + 3000X, and the Pearson correlation equals .50.

a) Suppose instead that Y refers to annual income, in thousands of dollars. State the pre- diction equation and the correlation.

b) Suppose that Y is treated as the explanatory vanable and X is treated as the response variable. Will the correlation coefficient or the slope change in value? Explain