9. Life Expectancy The average life expectancy in the United States has been rising steadily over the past few decades, as shown in the table. Year Life expectancy (a) Make a scatter plot of the data. 1920 54.1 (b) Find and graph the regression line. 1930 59.7 (c) Use the linear model you found in part (b) to predict the life expectancy in the year 1940 62.9 1950 68.2 2006. (d) Search the Internet or your campus library to find the actual 2006 average life expec- tancy. Compare to your answer in part (c). 1960 69.7 1970 70.8 1980 73.7 1990 75.4 2000 76.9

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