Toyota USA is studying the effect of regular versus high-octane gasoline on the fuel economy of its new high-performance, 3.5-liter, V6 engine. Ten executives are selected and asked to maintain records on the number of miles traveled per gallon of gas. The results are:

At the .05 significance level, is there a difference in the number of miles traveled per gallon between regular and high-octanegasoline?

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Miles per Gallon Miles per Gallon Exeive Regular High-0ctane xecutive Regular High-Octane Bowers Demars 28 31 35 40 29 37 25 31 45 42 Rau Greolke Burns 38 29 42 41 30 DeToto Kleg 47