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Engine Size and MPG

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					Correlation of Engine Size and
Fuel Consumption for Cars
Engine Size and MPG

  Is there a relationship between the
  engine size of a car and its MPG?
Engine Size and MPG

  Data : The data consists of 55 ordered
  pairs representing the engine size (x) in
  cubic inches and the rated miles per
  gallon for 55 cars.

  The source of the data was 1992
  Consumer Reports magazine
Engine Size and MPG
                    Engine size vs. MPGy = -0.0725x + 35.048      Here is a scatterplot
                                                   R2 = 0.642     and line of fit for the
      40                                                          data. The line looks like
      30                                                          a good fit. The
                                                                  correlation coefficient, r
MPG




      20
                                                                  is about 0.80. We can
      10                                                          conclude there is a
       0                                                          relatively strong
           0   50        100      150        200    250     300   correlation between
                               Engine Size                        engine size and MPG
Engine Size and MPG
                    Engine size vs. MPGy = -0.0725x + 35.048      Every increase of one
                                                   R2 = 0.642     cubic inch in engine
      40                                                          size results in about
      30                                                          7/100ths less miles per
                                                                  gallon.
MPG




      20

      10

       0
           0   50        100      150        200    250     300
                               Engine Size
Engine Size and MPG

  Car images from Wikimedia
  Commons

				
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posted:4/8/2010
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