data fw06p07; title 'CHAPTER 6, EXERCISE 7 ';
input  TRT    HOURS ;
cards;
  1       5.6
  1       5.7
  1       5.1
  1       3.8
  1       4.6
  1       5.1
  2       8.4
  2       8.2
  2       8.8
  2       7.1
  2       7.2
  2       8.0
  3      10.6
  3       6.6
  3       8.0
  3       8.0
  3       6.8
  3       6.6