A plastics molding factory that must treat its waste before discharge. The average amount of pollutant discharged (lb per day) depends on three factors: the chemical compound added (choose either chemical P or chemical Q); the treatment temperature (72 F or 100 F); and the stirring speed (200 rpm or 400 rpm). Determine the experimental unit, response, factor(s), factor levels, at least three nuisance factors, and treatments for this study.