A large petroleum company in the Southwest regularly conducts experiments to test additives to drilling fluids. Plastic viscosity is a rheological measure reflecting the thickness of the fluid. Various polymers are added to the fluid to increase viscosity. The following is a data set in which two polymers are used at two levels each and the viscosity measured. The concentration of the polymers is indicated as "low" and "high." Conduct an analysis of the 22 factorial experiments. Test for effects for the two polymers andinteraction.

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Polymer 1 High 11.3 21.7 Polymer 2 Low 12.0 22.4 Low High 3.5 11.7 12.0