Project 14: Findings on how the response variable, paint coat
thickness, depends on three input factors.

Col 1: belt speed.
Col 2: tube width.
Col 3: pump pressure.
Cols 4,5: Thickness of paint coat (in mm).

1.0  -2   -2   0.57  0.58
1.5  -2   -2   0.51  0.66
1.0  -1   -2   0.62  0.74
1.5  -1   -2   0.69  0.49
1.0  -2   -1   0.75  0.58
1.5  -2   -1   0.53  0.64
1.0  -1   -1   0.79  1.04
1.5  -1   -1   0.78  0.79