Since an interaction exists between “Weld energy” and “Weld pattern”, only an interaction plot is needed
and no main factor plots are necessary.
Interaction plot can be obtained by clicking
Stat
Æ
DOE
Æ
Factorial
Æ
Factorial Plots
. In the dialogue box, choose
Interaction Plot
and click
Setup
. In the Setup
dialogue box, select factor A and B to include into the plots.
P-value
A small (<0.05, a level of
significance) p-value indicates that
the two main factors and their
interactions have statistically
significant effect on the response.

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Dr. Jianbiao (John) Pan
Minitab Tutorials for Design and Analysis of Experiments
Page 28 of 32
The interaction plot is displayed below.