data fw09p11; title 'Chapter 9, Exercise 10';
input obs    DIET  GRAIN  $  PREP $  BV;
drop obs;
cards;
 1      1     SORGH     WHOLE     40.61
 2      1     SORGH     WHOLE     56.78
 3      1     SORGH     WHOLE     69.05
 4      1     SORGH     WHOLE     39.90
 5      1     SORGH     WHOLE     55.06
 6      1     SORGH     WHOLE     32.43
 7      2     SORGH     DECORT    74.68
 8      2     SORGH     DECORT    56.33
 9      2     SORGH     DECORT    71.02
10      2     SORGH     DECORT    53.35
11      2     SORGH     DECORT    41.43
12      2     SORGH     DECORT    33.00
13      3     SORGH     BSB       71.60
14      3     SORGH     BSB       62.64
15      3     SORGH     BSB       78.95
16      3     SORGH     BSB       69.86
17      3     SORGH     BSB       60.26
18      3     SORGH     BSB       67.05
19      4     LYSINE    WHOLE     42.46
20      4     LYSINE    WHOLE     50.78
21      4     LYSINE    WHOLE     48.88
22      4     LYSINE    WHOLE     44.12
23      4     LYSINE    WHOLE     48.86
24      4     LYSINE    WHOLE     43.39
25      5     LYSINE    DECORT    50.11
26      5     LYSINE    DECORT    57.46
27      5     LYSINE    DECORT    55.36
28      5     LYSINE    DECORT    57.28
29      5     LYSINE    DECORT    51.60
30      5     LYSINE    DECORT    53.96
31      6     LYSINE    BSB       60.57
32      6     LYSINE    BSB       62.62
33      6     LYSINE    BSB       66.20
34      6     LYSINE    BSB       54.32
35      6     LYSINE    BSB       47.11
36      6     LYSINE    BSB       41.56
37      7     MILLET    WHOLE     45.58
38      7     MILLET    WHOLE     68.51
39      7     MILLET    WHOLE     54.13
40      7     MILLET    WHOLE     45.15
41      7     MILLET    WHOLE     45.03
42      7     MILLET    WHOLE     39.72
43      8     MILLET    DECORT    46.19
44      8     MILLET    DECORT    45.54
45      8     MILLET    DECORT    42.57
46      8     MILLET    DECORT    30.23
47      8     MILLET    DECORT    38.83
48      8     MILLET    DECORT    40.28
49      9     MILLET    BSB       64.27
50      9     MILLET    BSB       56.48
51      9     MILLET    BSB       73.24
52      9     MILLET    BSB       67.18
53      9     MILLET    BSB       51.11
54      9     MILLET    BSB       32.97
55     10       .         .       87.77
56     10       .         .       91.80
57     10       .         .       81.13
58     10       .         .       80.88
59     10       .         .       66.06
60     10       .         .       73.36