The data in Table 7 shows that the percentage of female cigarette smokers in the United States declined from 22.1% in 1997 to 13.6% in 2015.

(A) Applying linear regression to the data for females in Table 7 produces the model f = –0.45t + 22.20 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.

(B) Estimate the first year in which the percentage of female smokers is less than 10%.

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Table 7 Percentage of Smoking Prevalence among U.S. Adults Males (%) 27.6 25.7 24.1 23.9 21.5 16.7 Year 1997 2000 2003 2006 2010 2015 Females (%) 22.1 21.0 19.2 18.0 17.3 13.6