Question

The U.S. Department of Energy’s Fuel Economy Guide provides fuel efficiency data for cars and trucks (Fuel Economy website, February 22, 2008). A portion of the data for 311 compact, midsize, and large cars is shown in Table 2.14. 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: Front wheel (F), rear wheel (R), and four wheel (4)
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 FuelData08.
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, and 35–39 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 5-9, 10-14, 15-19, 20-24, 25-29, 30-34, and 35-39 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 5-9, 10-14, 15-19, 20-24, 25-29, 30-34, and 35-39 for City MPG.
f. Comment on the relationship between Fuel Type and City MPG.


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  • CreatedSeptember 20, 2015
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