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Chapter 3: Q.29 (page 162)

The graph at the top right plots the gas mileage (miles per gallon) of various cars from the same model year versus the weight of these cars in thousands of pounds. The points marked with red dots correspond to cars made in Japan. From this plot, we may conclude that

(a) there is a positive association between weight and gas mileage for Japanese cars.

(b) the correlation between weight and gas mileage for all the cars is close to 1.

(c) there is little difference between Japanese cars and cars made in other countries.

(d) Japanese cars tend to be lighter in weight than other cars.

(e) Japanese cars tend to get worse gas mileage than other cars.

Short Answer

Expert verified

The correct option is D(Japanese cars tend to be lighter in weight than other cars).

Step by step solution

01

Given Information

The graph at the top right plots the gas mileage (miles per gallon) of various cars from the same model year versus the weight of these cars in thousands of pounds.

02

Explanation

From examining the scatterplot you can see those points in red all weigh less than 3,000 pounds, whereas there are many other cars greater than 3,000 pounds. Thus, Japanese cars tend to weigh less.

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