DATA FW10P08; TITLE 'CHAPTER 10, PROBLEM 8, GASOLINE ADDITIVES';
INPUT               OBS    ADDITIVE    RUN     MPG    CAR  $;
CARDS;
     1        1        1     19.5     A
     2        1        1     21.1     B
     3        1        1     21.1     D
     4        1        2     20.3     A
     5        1        2     21.2     B
     6        1        2     22.8     D
     7        1        3     19.4     A
     8        1        3     20.4     B
     9        1        3     21.7     D
    10        1        4     21.3     A
    11        1        4     20.6     B
    12        1        4     21.6     D
    13        2        1     18.0     A
    14        2        1     21.8     B
    15        2        1     20.5     D
    16        2        2     17.8     A
    17        2        2     21.2     B
    18        2        2     20.1     D
    19        2        3     17.8     A
    20        2        3     22.7     B
    21        2        3     21.2     D
    22        2        4     15.8     A
    23        2        4     23.1     B
    24        2        4     20.9     D
    25        3        1     16.8     A
    26        3        1     21.5     B
    27        3        1     18.5     D
    28        3        2     17.0     A
    29        3        2     20.2     B
    30        3        2     19.6     D
    31        3        3     16.8     A
    32        3        3     18.6     B
    33        3        3     20.3     D
    34        3        4     15.5     A
    35        3        4     20.3     B
    36        3        4     18.8     D