The following MINITAB output is for a best subsets regression involving five dependent variables X1,…, X5. The two models of each size with the highest values of R2 are listed.

Best Subsets Regression: Y versus X1, X2, X3, X4, X5 Response is Y Mallows X X X X X Vars R-Sq R-Sq(adj) C-p S 1 2 3 4 5 1 77.3 77.1 133.6 1.4051 X 1 10.2 9.3 811.7 2.7940 X 2 89.3 89.0 14.6 0.97126 X X 2 77.8 77.3 130.5 1.3966 X X 3 90.5 90.2 3.6 0.91630 X X X