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Experimental Objective

Suppose you are doing a pilot study to examine five strains of bacteria (X1--X5) and determine which, if any, might be worth further study for use in dairy products. Since the eventual goal is to minimize the pH of milk in which these bacteria are placed, a screening experiment will be used to identify the strains that influence the pH.

The factors in this experiment are the five strains (X1--X5). In each run of the experiment, a factor can have a coded value of -1 (strain absent) or 1 (strain present). The response variable is pH.