Cigarette smoking. The data in Table 7 shows that the percentage of male cigarette...

Cigarette smoking. The data in Table 7 shows that the percentage of male cigarette smokers in the U.S. declined from 27.6% in 1997 to 23.9% in 2006.

(A) Applying linear regression to the data for males in Table 7 produces the model

m = -0.42t + 27.23

where m is percentage of male smokers and t is time in years since 1997. Draw a scatter plot of the male smoker data and a graph of the regression model for 0 ≤ t ≤30.

(B) Estimate the first year in which the percentage of male smokers is less than 15%.