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The U.S. Department of Energy’s Fuel Economy Guide provides fuel efficiency data for cars and trucks (Fuel Economy website, September, 2012). A portion of the data for 149 compact, midsize, and large cars is shown in Table 2.13. The data set contains the following variables:
Size: Compact, Midsize, and Large
Displacement: Engine size in liters
Cylinders: Number of cylinders in the engine
Drive: All wheel (A), front wheel (F), and rear wheel (R)
Fuel Type: Premium (P) or regular (R) fuel
City MPG: Fuel efficiency rating for city driving in terms of miles per gallon
Hwy MPG: Fuel efficiency rating for highway driving in terms of miles per gallon
The complete data set is contained in the file named FuelData2012.
- a. Prepare a crosstabulation of the data on Size (rows) and Hwy MPG (columns). Use classes of 15–19, 20–24, 25–29, 30–34, 35–39, and 40–44 for Hwy MPG.
- b. Comment on the relationship between Size and Hwy MPG.
- c. Prepare a crosstabulation of the data on Drive (rows) and City MPG (columns). Use classes of 10–14, 15–19, 20–24, 25–29, 30–34, and 35–39, and 40–44 for City MPG.
- d. Comment on the relationship between Drive and City MPG.
- e. Prepare a crosstabulation of the data on Fuel Type (rows) and City MPG (columns). Use classes of 10–14, 15–19, 20–24, 25–29, 30–34, 35–39, and 40–44 for City MPG.
- f. Comment on the relationship between Fuel Type and City MPG.
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Chapter 2 Solutions
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