2. Experimental trials are run on an operating chemical process in which four variables are changed in accordance with a randomized factorial plan, in order to determine the effects of these variables on an impurity in the resulting product: Variable + concentration of catalyst (%) 5 7 concentration of NaOH (%) 40 45 agitation speed (rpm) 10 20 temperature ('F) 150 180 order 1 2 3 4 impurity 0.38 0.40 0.27 0.30 0.58 0.56 0.30 0.32 BUDGEUSOWANHASAN 0.59 + 0.62 0.53 + 0.50 0.79 + 0.75 + + 0.53 0.54 Calculate the effects Determine the significant effects using a normal probability plot. Summarize your findings, setting out the conclusions to be drawn from the experimental trials, and make recommendations with respect to how to run the process more optimally (the present conditions of operation are: catalyst concentration = 5%, NaOH concentration = 40%, agitation rate = 10 rpm, temperature = 180'F). Hint: You can make use of plots of marginal means