Cigarette smoking. The data in Table 7 shows that the percentage of female cigarette smokers in the U.S. declined from 22.1% in 1997 to 18.0% in 2006.
(A) Applying linear regression to the data for females in Table 7 produces the model
f = -0.47t + 22.19
where f is percentage of female smokers and t is time in years since 1997. Draw a scatter plot of the female smoker data and a graph of the regression model on the same axes for 0 ≤ t ≤30.
(B) Estimate the first year in which the percentage of female smokers is less than 10%.
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