Quick-print firms in a large downtown business area spend most of their advertising dollars on displays on bus benches. A research project involves predicting monthly sales based on the annual amount spent on placing ads on bus benches. A sample of quick-print firms revealed these advertising expenses and sales:

a. Draw a scatter diagram.
b. Determine the correlation coefficient.
c. What is the coefficient of determination?
d. Compute the regression equation.
e. Estimate the monthly sales of a quick-print firm that spends $4,500 on bus bench advertisements.
f. Summarize yourfindings.

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Annual Bus Bench Advertising $ thousands) Monthly 0 Sales ($ thousands) 10 Firm 30 50 20