Steve taylor is the owner of Home Plus, which is a chain of home improvement stores. He would like to investigate the relationship between month advertising and monthly sales. The table below shows the amount spent on advertising, in millions of dollars, over several months along with the corresponding sales, also in millions of dollars.

Use the Home Plus data to:
a) Describe the regression line that will predict monthly sales based on the monthly advertising
b) Interpret the slope of the regression equation
c) Predict the average number of sales for a month with $2 million spent on advertising.

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Month Advertising (S millions) Sales (S millions) 13 12 21 2