4- The yield of a chemical process is being studied. The two most important variables are thought to be the pressure (A) and the temperature (B). Three levels of each factor are selected, and a factorial experiment with two replicates is performed. a. Based on Minitab output presented below, analyze the data and draw conclusions. Use a 0.05. General Linear Model: Yield versus A, B Factor Type Levels Values A B fixed fixed 3 200, 215, 230 3 150, 160, 170 Analysis of Variance for Tield, using Adjusted 55 for Tests 2 E 2 2 Source Dr Seq SS Adj 55 Adj 0.76778 0.76778 0.38389 0.30111 0.30111 0.15056 40.06889 0.06889 0.01722 9 0.16000 0.16000 0.0177 Total 17 1.29778 A*B Error T 21.59 0.000 8.47 0.009 0.97 0.470 5 0.133333 --87.67 -5q(adj) -76.719 b. What percentage of observed variation in the yield of this chemical process is due to pressure and temperature settings? c. Use main and/or interaction effect plots, shown below, to determine conditions under which this process should be operated.