1. (6 points) The "All possible models" procedure was applied to selecting the best subset of the potential predictor variables X1, X2, X3, and X4. Based on the following output, which subset of predictor variables you would recommend according to R, R2 ,, and PRESS,,, respectively? 12 12 . adj PRESSP 0. 625254276 0. 614232343 0181342 0 . 093021988 0 . 066346164 2 . 4802794 0. 035534871 0 . 007168249 - 6754589 0 . 005265526 -0. 023991370 2 - 7560133 0. 660449662 0. 639870854 0. 9797197 0. 658310464 0 . 637602008 0. 9766704 N W WW WW NI 0. 642243113 0. 620560878 1. 0067511 NNNNNNN 0. 150308517 0. 098812063 . 4966168 0. 093813565 0. 038893175 2 . 6949565 0. 035535207 -0.022917205 2. 8434007 0. 706509144 0. 678994376 0. 8886516 0 . 670782445 $3991 8300 0. 9880732 0 . 662488768 47090 1. 0169492 156695 0. 07763585 2. 6689694 0. 706637190 668783925 0. 9431243 2. (4 points) Which of the following are legitimate values for a-to-enter and a-to-remove, respectively, in forward stepwise procedure: (a) 0.05 and 0.10, (b) 0.10 and 0.05, (c) 0.05 and 0.01? Explain. Search W C