It is important to study the effect of the concentration of the reactant and the

Question

It is important to study the effect of the concentration of the reactant and the feed rate on the viscosity of the product from a chemical process. Let the reactant concentration be factor A at levels 15% and 25%. Let the feed rate be factor B, with levels 20 lb/hr and 30 lb/hr. The experiment involves 2 experimental runs at each of the four combinations. Looking at the ANOVA table for the effects which one is the best answer: Analysis of Variance for Viscosity. a. Factor A has a significant effect on viscosity but not B. b. Factor B has a significant effect on viscosity but not A. c. The interaction of both factors A and B has the most significant effect on the viscosity of the product. d. Main effects of factor A and factor B have a significant effect on the viscosity of the product, but not the interaction.

Explanation / Answer

Since P values for A and B are very small, main effect of factor A and factor B have a significant effect on the viscosity of the product.

For the interaction we will look towards the P-values of A*B. Since the P-value >0.05 the interaction is not significant at 5% significance level.

Thus, option d. is best alternative in this case.

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