Montrose Oil and Lube is a car care center specializing in ten-minute oil changes. Montrose Oil and Lube has two service bays, which limits its capacity to 4,000 oil changes per month. The following information was collected over the past six months:

1. Prepare a scatter plot graphing the volume of oil changes (x-axis) against the company's monthly operating expenses (y-axis). Graph by hand or use Excel.
2. How strong 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 costs 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 3,800 oil changes per month? Explain.

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Number of Oil Changes 3,200 2,600 2,800 2,700 3,600 2,900 Operating Expenses Month January. $36,400 $31,900 $32,850 February March April $32,500 $37,000 $33,700 May June