35.Exercise 7 (page 279) gives data on fuel consumption in miles per gallon (mpg) and speed in miles per hour (mph) for a small car. From these data, the least-squares regression line to predict gas performance from speed is
What are the observed fuel consumption values for speeds of 6.2, 43.5, and 93.2 mph?
What are the predicted fuel consumption values for speeds of 6.2, 43.5, and 93.2 mph? (Round your answers to two decimal places.)
Redo your scatterplot of fuel against speed from Exercise 7. Draw the least-squares regression line on your scatterplot.
Based on the answer to part (c), is this line a useful model? Why or why not?