# 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
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
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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