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Gasoline Additive

To learn about the effect of a newly developed gasoline additive on gas mileage (mpg), seven cars were driven 300 miles first without additive and then 300 miles with a gas additive. Here are the mpg's. Did the new additive improve gas mileage? Also, is the test dependent or independent.

Car # mpg without additive mpg with additive

1 24.2 23.5

2 30.4 29.6

3 32.7 32.3

4 19.8 17.6

5 25.0 25.3

6 24.9 25.4

7 22.2 20.6

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