6-8

1. Prepare a scatter plot graphing the volume of oil changed (x-axis) against the company's monthly operating expenses (y-axis). Use Excel

2. How strong of a relationship does there appear to be between the company's operating expenses and the number of oil changes performed each month? Explain. Do there appear to be any outliers in the data? Explain.

3. Based on the graph, do the company's operating cost appear to be fixed, variable, or mixed? Explain how you can tell.

4. Would you feel comfortable using this information to project operating costs for a volume of 4,000 oil changes per month? Explain.