Consider the property valuation data found in Table B.4.
a. Use the all-possible-regressions method to find the "best" set of regressors.
b. Use stepwise regression to select a subset regression model. Does this model agree with the one found in part a?

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y X1 X2 X4 Xs X6 X7 5 X8 Xg 25.9 4.9176 1.0 3.4720 0.9980 1.0 7 4 42 0 29.5 5.0208 1.0 3.5310 1.5000 2.0 7 4 62 0 279 4.5429 1.0 2.2750 1.1750 1.0 6 3 40 0 25.9 4.5573 1.0 4.0500 1.2320 1.0 6 3 54 0 29.9 5.0597 1.0 4.4550 1.1210 1.0 6 3 42 29.9 3.8910 1.0 4.4550 0.9880 1.0 6 3 56 30.9 5.8980 1.0 5.8500 1.2400 1.0 7 3 51 28.9 5.6039 1.0 9.5200 1.5010 0.0 6 3 32 35.9 5.8282 1.0 6.4350 1.2250 2.0 6 3 32 31.5 5.3003 1.0 4.9883 1.5520 1.0 6 31.0 6.2712 1.0 5.5200 0.9750 1.0 30.9 5.9592 1.0 6.6660 1.1210 2.0 30.0 5.0500 1.0 5.0000 1.0200 0.0 36.9 8.2464 1.5 5.1500 1.6640 2.0 41.9 6.6969 1.5 6.9020 1.4880 1.5 40.5 7.7841 1.5 7.1020 1.3760 1.0 43.9 9.0384 1.0 7.8000 1.5000 1.5 37.5 5.9894 1.0 5.5200 1.2560 2.0 37.9 7.5422 1.5 5.0000 1.6900 1.0 44.5 8.7951 1.5 9.8900 1.8200 2.0 37.9 6.0831 1.5 6.7265 1.6520 1.0 38.9 8.3607 1.5 9.1500 1.7770 2.0 36.9 8.1400 1.0 8.0000 1.5040 2.0 45.8 9.1416 1.5 7.3262 1.8310 1.5 13232433333 43434 56587676686878 3 30 2 30 3 32 46 1 50 22 3 17 3 23 40 22 48 3 31