BUSINESS: Cigarettes The following graph gives the number of cigarettes per capita s...

BUSINESS: Cigarettes The following graph gives the number of cigarettes per capita sold to adults in the United States in recent years.

a. Number the years (bars) with x-values 1–5 so that x stands for years since 2007, and use linear regression to fit a line to the data. State the regression formula. [Hint: See Example 9.]

b. Interpret the slope of the line.

c. Use the regression line to predict the number of cigarettes per capita sold in the year 2020. Source: Centers for Disease Control