the fuel efficiencies for a sample of 27 compact, midsize, and large cars are entered into a statistical software package. analysis of variance is used to investigate if there is a difference in the mean miles per gallon of the three car sizes. what do you conclude? use the .01 significance level. the results of the analysis follow: lind, douglas. statistical techniques in business and economics (p. 420). mcgraw-hill higher education. kindle edition.