Exercise 12.5
        Y          X1           X2  
     -1.4200     -1.6500      -.6700
      2.7500      1.4800       .7000
      2.1000       .7700       .3200
     -5.0800       .6700      2.8800
      1.4900       .6800      -.1900
      1.0000       .2300     -1.2800
       .1600      -.4000     -2.7200
     -1.1100     -1.1300      -.7000
      1.6600       .1500     -1.5500
      -.2600      -.6300      -.7400
     -4.8700       .3400     -1.8700
      5.9400       .3500      1.5600
      2.2100       .7900       .3700
     -6.8700       .7700     -2.0700
       .9000     -1.0400      1.2000
      1.6100       .2800       .2600
      2.1100       .5800     -1.3400
     -3.8200      -.4100     -2.1000
      -.6200     -1.7800       .6100
      7.0100      1.2500      2.3200
     26.1400       .2200      4.3800
      7.3900      1.2500      2.1600
       .7900      -.1200      1.5100
      1.9300       .6600       .3000
      1.9700      1.0600      -.1700
    -23.1700      -.6600      7.8200
     -2.5200     -1.1800     -1.1500
     -1.2600      -.8000      1.7700
      -.1500     -1.3200      2.9200
      3.4100       .1600     -1.9400
     -5.4500      1.0600      2.0900
      1.3100      -.6000      1.5000
      1.5200       .7900      -.4600
      2.0400       .8600       .1900
      3.0000      2.0400      -.3900
      6.3100      -.5100      1.5400
      5.5100       .0200      1.8700
    -15.2200       .3300     -3.4500
     -1.4700     -1.9900      -.8800
     -1.4800       .7000     -1.5300
      6.6600      -.1700      1.4200
      1.7800       .3300     -2.7000
      2.6200       .4800      1.7700
     -5.1600      1.9000     -1.8900
     -4.7100      -.1800     -1.8500
      -.3500      -.1800      2.0100
      -.4800     -1.6200      1.2600
      1.2400       .3900     -2.0200
       .6900       .1700      1.9100
      1.9100      1.0200     -2.2300