The figure shows mean life expectancy versus age for males and females in the United States in 2009, up to the age of 119. Females are represented by the blue circles and males by the red squares. These figures were reported by the CDC.
a. Find your own age on the graph, and estimate your life expectancy from the appropriate graph.
b. Would it make sense to find the best straight line for this graph? Why or why not?
c. Is it reasonable to predict the life expectancy for a person who is 120 from the regression line for these data? Why or why not?
d. Explain what it means that nearly all of the blue circles (for women) are above the red squares (for men). (Above the age of 100, the red squares cover the blue circles because both are in the same place.)

Transcribed Image Text:

90 80 70 60 5 50 40 Gender . Female 2 Male n20 10 "普 0 20 40 60 80 100 120 Age (years)