data fw05p08; title 'CHAPTER 5, EXERCISE 8';
input  WITH    WITHOUT    DIFF;
cards;
  21.0      20.6     -0.4
  30.0      29.9     -0.1
  29.8      30.7      0.9
  27.3      26.5     -0.8
  27.7      26.7     -1.0
  33.1      32.8     -0.3
  18.8      21.7      2.9
  26.2      28.2      2.0
  28.0      28.9      0.9
  18.9      19.9      1.0
  29.3      32.4      3.1
  21.0      22.0      1.0