Chapter 9, Problem 9.2.12RE

a.

To determine

To find: The regression equation for the given data.

To construct: The scatterplot for the variables the engine displacements and the fuel efficiencies with the regression line.

b.

To determine

To obtain: The predicted value of the fuel efficiency with $x=86$ cubic inches if x is meaningful.

To explain: The reason that the x value is not meaningful.

c.

To determine

To obtain: The predicted value of the fuel efficiency with $x=198$ cubic inches if x is meaningful.

To explain: The reason that the x value is not meaningful.

d.

To determine

To obtain: The predicted value of the fuel efficiency with $x=289$ cubic inches if x is meaningful.

To explain: The reason that the x value is not meaningful.

e.

To determine

To obtain: The predicted value of the fuel efficiency with $x=407$ cubic inches if x is meaningful.

To explain: The reason that the x value is not meaningful.