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You do NOT need Minitab ... it is the perfect way to make a mess of control charts.Use average range to calculate limits. You do NOT need normally distributed data.Please read my papers and Dr Wheeler's books.
You do NOT need Minitab ... it is the perfect way to make a mess of control charts.
Use average range to calculate limits.
You do NOT need normally distributed data.
Please read my papers and Dr Wheeler's books.