The data for gas mileage and engine displacement for 121 vehicles from Exercise 4.72 are on the

Question:

The data for gas mileage and engine displacement for 121 vehicles from Exercise 4.72 are on the WeissStats CD.
In exercise
The magazine Consumer Reports publishes information on automobile gas mileage and variables that affect gas mileage. In one issue, data on gas mileage (in miles per gallon) and engine displacement (in liters) were published for 121 vehicles. Those data are available on the WeissStats CD.
a. Decide whether finding a regression line for the data is reasonable.
b. Obtain the coefficient of determination.