A car rental agency is interested in comparing 3 brands of gasoline designated Brand 1, Brand 2, and Brand 3.It makes four runs with each brand and determines the mileage/gallon for each run as shown below.Is there a significant difference among the 3 brands?(Usea= .05)

Brand 1

Brand 2

Brand 3

15.2

18.5

19.6

16.1

17.5

19.3

16.8

18.2

18.7

15.9

17.8

18.7