Concept explainers
Life Expectancy The following table shown men’s and women’s life expectancy at birth (in years) for selected birth years in United States: (Data from: U.S. Center for National Health Statistics.)
Life Expectancy
Birth Year Men Women
1970 67.1 74.7
1975 68.8 76.6
1980 70.0 77.4
1985 71.1 78.2
1990 71.8 78.8
1995 72.5 78.9
2000 74.1 79.3
2005 75.0 80.1
2010 76.2 81.0
2015 77.1 81.7
Find the least-squares regression line for the men’s data, with
Find the least-squares regression line for the women’s data, with
Suppose life expectancy continues to increase as predicted by the equations in parts (a) and (b). Will men’s life expectancy ever be higher than the women’s? If so, in what birth year will this occur?
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Mathematics with Applications In the Management, Natural, and Social Sciences (12th Edition)
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