Smoking 2009, women and men In Exercise 16, we examined the percentage of men aged 18–24 who smoked from 1965 to 2009 according to the Centers for Disease Control and Prevention. How about women?...

Smoking 2009, women and men In Exercise 16, we examined the percentage of men aged 18–24 who smoked from 1965 to 2009 according to the Centers for Disease Control and Prevention. How about women? Here’s a scatterplot showing the corresponding percentages for both men and women:

c) Viewed alone, the trend for men may have seemed to violate the Linearity Condition. How about the trend for women? Does the consistency of the two patterns encourage you to think that a linear model for the trend in men might be appropriate? (Note: there is no correct answer to this question; it is raised for you to think about.)