Asterisk in DOE minitab software

Siavash

Starting to get Involved
#1
Hi every one I wish you have a great day, I need your help, i want to design an experiment but whatever I did i faced asterisks in my final job and I cannot get the answer, even I have increased the number of my replication and decreased the number of interaction factors to 2 but it does not work, I really appreciate if you can help me.
 
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#2
We need more detail. What type of experiment are you trying to design? Where do the asterisks appear? If you attach your Minitab project file, it would help. I can open Minitab 18 or lower.
 

Siavash

Starting to get Involved
#3
We need more detail. What type of experiment are you trying to design? Where do the asterisks appear? If you attach your Minitab project file, it would help. I can open Minitab 18 or lower.
Firstly I made the regression equation, then I have designed the experiment and entered the answers by regression equation then I got the last picture answers
 

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