Design Of Experiments, Factorials, Sas, Experiment, Optimization.
4.Which main effects are you interested in? 5.Which 2-way interactions are you interested in? 6.Which 3-way interactions are you interested in? 7.Which 4-way interactions are you interested in? What if I only have 16 pens, instead of 32, and I am interested in each main effect and 2-way interaction