Chapter 15: A 2 to the 3 factorial experiment. Design and
calculation columns.

Col 1: Levels for temperature (T), 160 (-) and 180 (+) degrees
Col 2: Levels for concentration (C), 20 (-) and 40 (+) percent
Col 3: 2 catalysts (K), A = - and B = +.   
Col 4: TC interaction.
Col 5: TK interaction.
Col 6: CK interaction.
Col 7: TCK interaction.
Col 8: RESULT (yield in %'s).

      -   -   -     +   +   +   -       60
      +   -   -     -   -   +   +       72
      -   +   -     -   +   -   +       54
      +   +   -     +   -   -   -       68
      -   -   +     +   -   -   +       52
      +   -   +     -   +   -   -       83
      -   +   +     -   -   +   -       45
      +   +   +     +   +   +   +       80