Regression-correlation analysis comprehensive problem Luxury Cars, Inc. imports a va- riety 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 Sales Interest Unemployment Dow-Jones Industrial Month Volume Rate Rate Average 123 $900,000 8.0 5.0 2,900 750,000 8.4 5.2 2,650 800,000 8.3 5.5 2,800 4 550,000 9.0 4.7 2,550 5 780,000 8.2 3.9 2,700 6 880,000 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 11 925,000 7.2 3.8 2,880 12 675,000 7.0 4.5 2,725