options ls=80;

data insuranc;
input y x z;
xz=x*z;
cards;
  17  151  0
  26   92  0
  21  175  0
  30   31  0
  22  104  0
   0  277  0
  12  210  0
  19  120  0
   4  290  0
  16  238  0
  28  164  1
  15  272  1
  11  295  1
  38   68  1
  31   85  1
  21  224  1
  20  166  1
  13  305  1
  30  124  1
  14  246  1
;

proc reg data=insuranc;
 model y= x z;
 model y=x z xz;