There is an excellent resource for your situation. It is:
Handling Non-Normal DataBy Shree Padnis
Read this one and you will find it really good.
Shereen A. MosallamSix Sigma Master Black Belt
So now you know that your response is number of laundry pieces.
All what you have to do is to go back to your historical data to decide on the levels of each factor (guest type).
Then you go back to Minitab to design an experiment. Minitab will give you a table of combination of the factors at different levels.
You have to try these levels…[Read more]
You have a very intersting situation.
What I understand here that your only concern in your study is the type of guest(8 of them)
The levels refer to each factor:
*First decide, will you take the 8 types as your factors? this means you will have 8 factors. Screening experiment ill help you to choose from them the key factors…[Read more]