Notation Using the weights (Ib) and highway fuel consumption amounts (mi/gal) of the
48 cars listed in Data Set 35 "Car Data" of Appendix B, we get this regression equation:
ý = 58.9 - 0.00749x, where x represents weight.

1. What does the symbol y represent?
2. What are the specific values of the slope and y-intercept of the regression line?
3. What is the predictor variable?
4. Assuming that there is a significant linear correlation between weight and highway fuel consumption, what is the best predicted value of highway fuel consumption of a car that weighs 3000 lb?