Trucks versus cars. Consumers are turning to trucks, SUVs, and minivans in place of passenger cars. Here are data on sales of new cars and trucks in the United States. (The definition of “truck” includes SUVs and minivans.)

Plot two line graphs on the same axes to compare the change in car and truck sales over time. Describe the trend that you see.

Year: 1981 1983 1985 1987 1989 1991 1993 Cars (1000s): 8,536 9,182 11,042 10,277 9,772 8,589 8,518 Trucks (1000s): 2,260 3,129 4,682 4,912 4,941 4,167 5,681

Year: 1995 1997 1999 2001 2003 2005 Cars (1000s): 8,636 8,273 8,697 8,422 7,615 7,667 Trucks (1000s): 6,481 7,226 8,717 9,050 9,356 9,777

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250 Average number of sunspots 50 50 100 150 200 T T T 0 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 Year Figure 10.17 The sunspot cycle, for Exercise 10.19. This is a line graph of the average number of sunspots per month for the years 1900 to 2007. (Data from the National Oceanic and Atmospheric Administration. This figure was created using the Minitab software package.)