c h a p t e r 2 Graphical Summaries of Data Introduction Are cars becoming more fuel efficient? Increasing prices of gasoline, along with concerns about the environment, have made fuel efficiency an important concern. To determine whether recently built cars are getting better mileage than older cars, we will compare the U.S. Environmental Protection Agency highway mileage ratings for model year 2009 cars with the mileages for model year 2000 cars. The following tables present the results, in miles per gallon. Highway Mileage Ratings for 2000 Compact Cars 28 21 30 33 24 29 30 38 27 23 27 34 21 27 38 28 29 21 31 31 32 23 36 28 27 32 31 30 26 23 40 28 27 27 34 28 34 28 38 27 29 27 33 24 31 33 27 28 26 26 31 16 28 30 30 24 37 35 30 33 31 32 Highway Mileage Ratings for 2009 Compact Cars 30 30 27 15 14 17 28 26 25 34 29 26 25 33 35 35 25 30 25 25 25 21 17 18 17 21 18 25 34 33 18 18 27 28 30 25 26 31 30 35 29 29 25 29 28 26 28 26 26 25 30 19 22 26 29 Source: www.fueleconomy.gov 35
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