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Chapter 1: Q 40. (page 43)

Fuel efficiency In an earlier example, we examined data on highway gas mileages of the model year 2009 midsize cars. The dot plot below shows the difference (highway – city) in EPA mileage ratings for each of the 24car models from the earlier example.

(a) Explain what the dot above 6represents.

(b) What does the graph tell us about fuel economy in the city versus on the highway for these car models? Be specific.

Short Answer

Expert verified

Part (a) The dot above 6 denotes that one of 21 automobile models had EPA mileage that was higher on the highway than in the city.

Part (b) In comparison to the city, the highway has a higher EPA mileage

Step by step solution

01

Given information

Given graph :

02

Part (a) Step 2: Concept

Dot-plots in the figure indicates the distance between highway and city that are presented as mileage.

03

Part (a) Step 3: Explanation

The dot-plot shows the difference in EPA mileage ratings (highway-city) for each of the 21car models. The dot above 6 indicates that one of 21 automobile models had EPA mileage that was 6 points greater on the highway than in the city.

04

Part (b) Step 1: Explanation

In comparison to the city, the highway has a higher EPA mileage. On the highway, fuel economy is better than in the city.

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