Final G$\mathrm{.}5$

We are still thinking about the jet aircraft engine factory and the designed experiments which were run.

Your boss has asked you to run two versions of the model, Model $1$ and Model $2.$

Model $1$ turns out to be exactly the model we have been studying, with only the factors A$,$ B$,$ C$,$ D$,$ AB$,$ and AC$.$

Model $2$ turns out to be a little fancier, with only the factors A$,$ B$,$ C$,$ D$,$ AB$,$ AC$,$ BC$,$ and ABC. It has essentially added the BC and the ABC interactions.