Graphic analysis of cost-volume data Luxury Cars, Inc. imports a variety of cars targeted for the high-priced end of automobile market. Over the last three years, the company's sales volume has varied significantly. In an effort to plan better for inventory and other resources, management would like to find a good method of estimating sales volume. Below are monthly sales and other data randomly selected from the last three years:

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Prime Dow-Jones Sales Interest Unemployment Industrial Month Volume Rate Rate Average 1234567 $900,000 8.0 5.0 2,900 2 750,000 8.4 5.2 2,650 3 800,000 8.3 5.5 2,800 550,000 9.0 4.7 2,550 5 780,000 8.2 3.9 2,700 880,000 7.8 3.4 2,850 7 620,000 6.6 4.6 2,625 8 520,000 8.9 4.0 2,600 9 810,000 7.1 5.2 2,780 10 740,000 7.5 4.4 2,700 12 11 925,000 7.2 3.8 2,880 12 675,000 7.0 4.5 2,725