Question: Suppose Toyota Motor Corporation is studying the effect of regular versus high-octane

gasoline on 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:

Miles per Gallon Miles per Gallon

Executive Regular High-Octane Executive Regular High-Octane

Bowers 25 28 Rau 38 40

Demars 33 31 Greolke 29 29

Grasser 31 35 Burns 42 37

DeToto 45 44 Snow 41 44

Kleg 42 47 Lawless 30 44

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

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