Manufacturing integrated circuits is an enormously complicated
task, as
there are many process variables that can be manipulated (thickness
of this,
width of that, doping level of something else, etc). Generally
speaking, many
copies of a circuit are put onto a single wafer, which is made all
at once. We
have an experiment where we are varying two factors, each at two
levels.
We have 20 wafers and assign each of the four factor/level
combinations to
five wafers at random...