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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.
Estimated Age-Adjusted Percent Smoking Cigarettes
Year Female Male1965 33.7 51.21974 16.9 42.81979 25.3 371985 22.5 32.21990 23.7 281995 15.4 26.51998 25.8 25.91999 22.9 25.22000 21.6 25.22001 30.1 24.62002 20.1 24.62003 19.4 23.7
a. Describe the linear relationship between the estimated age-adjusted percent smoking and time for females and males separately.
b. How much of the variation in the percents is accounted for by time for females and males? Interpret your findings.
c. Do females and males appear to have the same rate of decrease in the estimated age-adjusted percent smoking (explain answer)
d. 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)
e. Do you think this assumption is reasonable? Explain your answer.
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