Question: The estimated age-adjusted percent of persons 18 years of age and over who smoke cigarettes are shown below for females and males for selected years.

1. Is there a relationship between males and females?
2. Describe the linear relationship between the estimate age-adjusted percent smoking and time for females and males separately. (2 points)
3. How much of the variation in the percents is accounted for by time for females and males? Interpret your findings (in your interpretation include a comparison). (2 points)
4. Do females and males appear to have the same rate of decrease in the estimated age-adjusted percent smoking (explain your answer)? (2 points)

e. Provide an estimate when the age-adjusted percent of males who smoke will equal the corresponding percent for females. What assumption(s) have you made in coming up with the estimate at this time point? (Hint: plot the regression lines) (Extra Credit: 3 points)

f. Do you think this assumption is reasonable? Explain your answer. (Extra Credit: 2 points)

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