An article in Process Engineering (1992, No 71, pp 4647) presented a two factor factorial experiment to investigate the effect of pH and catalyst concentration on product viscosity (cSt) The data are as follows (a) Test for main effects and interactions using Icirc plusmn 0 05 What are your conclusions (b) Graph the interaction and discuss the information provided by this plot (c) Analyze the residuals from this experiment Catalyst Concentration 2 7 178, 186, 179, 188 197, 196, 204, 204 2 5 pH 192, 199, 189, 198 185, 193, 185, 192 5 6 5 9

Question: An article in Process Engineering (1992, No. 71, pp. 4647) presented a two-factor factorial experiment to investigate the effect of pH and catalyst concentration on

An article in Process Engineering (1992, No. 71, pp. 46€“47) presented a two-factor factorial experiment to investigate the effect of pH and catalyst concentration on product viscosity (cSt). The data are as follows:

Catalyst Concentration 2.7 178, 186, 179, 188 197, 196, 204, 204 2.5 pH 192, 199, 189, 198 185, 193, 185, 192 5.6 5.9

(a) Test for main effects and interactions using Î± = 0.05. What are your conclusions?

(b) Graph the interaction and discuss the information provided by this plot.

Catalyst Concentration 2.7 178, 186, 179, 188 197, 196, 204, 204 2.5 pH 192, 199, 189, 198 185, 193, 185, 192 5.6 5.9

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