A research institution says that gasoline is gasoline. That is, there is no difference among different brands of gasoline in terms of mileage per gallon.

An independent consumer rights organization did an experiment on three different brands of gasoline. It divided cars of the same make and the same condition into three groups, and the members of each group were filled with a different brand of gasoline. The test results follow. Do the data support the hypothesis of no difference among gasolines? Do a 5 % test.

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