data fw09p06; title 'CHAPTER 9, PROBLEM 6, TREE DATA';
input OBS    CONC    GROWTH ;
cards;
  1     0.0      3.00
  2     0.0      7.50
  3     0.0      3.50
  4     0.0     15.67
  5     0.5      8.00
  6     0.5      9.00
  7     0.5      9.50
  8     0.5      9.75
  9     1.0      4.25
 10     1.0      6.66
 11     1.0     11.50
 12     1.0     21.41
 13     2.5      3.63
 14     2.5      8.33
 15     2.5     12.50
 16     2.5     15.00
 17     5.0     12.33
 18     5.0      7.00
 19     5.0     17.50
 20     5.0      7.67
 21    10.0     10.50
 22    10.0     17.00
 23    10.0     11.75
 24    10.0     29.25
 25    15.0     16.00
 26    15.0     24.75
 27    15.0     31.50
 28    15.0     31.25
 29    25.0     32.75
 30    25.0     26.50
 31    25.0     35.00
 32    25.0     30.66
 33    50.0     39.00
 34    50.0     27.75
 35    50.0     41.00
 36    50.0     38.00