U.S. life expectancy has been steadily increasing (see

Chapter 2, Problem 18

(choose chapter or problem)

U.S. life expectancy has been steadily increasing (see Exercise 15 in Section 2.1 and data file for LIFEPXEC). The following graph shows the roughly linear trends for both males and females over more than three decades. a. According to these data, what is the life expectancy of a female born in 1970? Of a male born in 2005? b. Sketch a straight line to create a linear approximation of the data for your gender. Males and females will have different lines. c. Identify two points on your line and calculate the slope. What does your slope mean in this context? The male slope is steeper than the female slope. What does that imply? d. Generate a linear function for your line. (Hint: Let the independent variable be the number of years since 1970.) e. What would your model predict for your sexs life expectancy in 2010? How close does your model come to Census Bureau current predictions of life expectancies in 2010 of 75.6 years for males and 81.4 for females?