1.Researchers were interested in determining which of three new midsized, four-cylinder automobiles (Focus, Impreza, Civic) is most fuel efficient in terms of miles travelled per gallon of gasoline.All three types of cars have approximately the same size engine and weight.To determine the most fuel-efficient car, researchers conducted an experiment involving 15 cars, five of each make.Each car was tested once.All cars were supplied with a special gas tank containing 1 gallon of gasoline and driven over a test course until it ran out of gasoline.The mileage driven was then recorded.Fifteen professional test car drivers were randomly assigned to drive the fifteen cars.

Minitab output

So (20 ] ) 36 95% CIS For Mean Basco on Pool.co StDev SLDOV OCUS 27.400 1.140 29. 890 28 .400