The accompanying data is on y = profit margin of savings and loan companies in a given year. x = net revenues in that year, and x2 = number of savings and loan branches offices. X1 x2 y X1 X2 y X1 X2 y 3.92 7298 0.75 3.42 6352 0.82 4.25 7546 0.72 3.61 6855 0.71 3.45 6361 0.75 4.41 7931 0.55 3.32 6636 0.66 3.58 6369 0.77 4.49 8097 0.63 3.07 6506 0.61 3.66 6546 0.78 4.70 8468 0.56 3.06 6450 0.70 3.78 6672 0.84 4.58 8717 0.41 3.11 6402 0.72 3.82 6890 0.79 4.69 8991 0.51 3.21 6368 0.77 3.97 7115 0.70 4.71 9179 0.47 3.26 6340 0.74 4.07 7327 0.68 4.78 9318 0.32 3.42 6349 0.90 a. Determine the multiple regression equation for the data. b. Compute and interpret the coefficient of multiple determination, R.