
246 Six Sigma Case Studies with Minitab
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that effect. To this end, main effects plots and interaction plots are produced.
The following is the approach to doing so.
Click on “Factorial Plots” as shown in Figure14.25. As a result, the dialog
box shown in Figure14.26 opens. Check the boxes for “Main Effects Plot”
and “Interaction Plot”, click on “Setup” for “Main Effects Plot”, and the dia-
log box shown in Figure14.27 opens. For “Responses”, select “Yield”, and for
“Selected”, select “Time” and “Temp” as shown in Figure14.27. “Catalyst” is
FIGURE 14.26
Selection of “Main Effects Plot” and “Interaction Plot” for Yield.
FIGURE 14.25
Selection of ...