Refer to the savings and loan association data given in Table 12.1.

a. Estimate, by least squares, the regression of profit margin on number of offices.
b. Estimate, by least squares, the regression of net revenues on number of offices.
c. Estimate, by least squares, the regression of profit margin on net revenues.
d. Estimate, by least squares, the regression of number of offices on net revenues.

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REVENUE PER NUMBER OF PROFIT REVENUE NUMBER OF PROFIT YEAR PER DOLLAR OFFICES MARGIN YEAR DOLLAR 1 10 12 13