27.2 Interpretation of Results
In this example, the resulting significant effects are the main effect A (Gas Flow = 9) and the interaction AB (Gas Flow × Intensity = −6,5). Factor C (speed of the production chain) is inert.
Since factors A and B interact, it is necessary to draw an interaction plot to interpret the results. To do so, choose Stat > DOE > Factorial > Factorial Plots.
Use first the option Interaction Plot.
Use now the option Cube Plot. The displayed dialog box looks similar to the previous one.
The two interaction plots are equivalent; from one you can build the other (the following plots have been edited to increase the font size of the numbers):
The best result is obtained with a gas flow of 12 l/min and an intensity of 230 A. Note that if you ever need, whatever the ...