data fw06p11; title 'CHAPTER 6, PROBLEM 11, SOIL CHEMICALS';
input   SOIL $  CD   PB ;
cards;
  A      0.54    15
  A      0.63    19
  A      0.73    18
  A      0.58    16
  A      0.66    19
  A      0.70    17
  B      0.56    13
  B      0.56    11
  B      0.52    12
  B      0.41    14
  B      0.50    12
  B      0.60    14
  C      0.39    13
  C      0.28    13
  C      0.29    12
  C      0.32    13
  C      0.30    13
  C      0.27    14
  D      0.26    15
  D      0.13    15
  D      0.19    16
  D      0.28    20
  D      0.10    15
  D      0.20    18
  E      0.32    12
  E      0.33    14
  E      0.34    13
  E      0.34    15
  E      0.36    14
  E      0.32    14