Hypothesis Testing in DMAIC Projects

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Hypothesis Testing in DMAIC Projects
Zafar Kamal, Consultant, Canada, Member
Is hypothesis testing a must in DMAIC projects? Why (not)? (...) Read more? Sign up for free

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  Hypothesis Testing in DMAIC?
Jens Folke, Consultant, Denmark, Member
  Sometimes a DMAIC project can be based on Six Sigma process mapping only, i.e. SIPOC/IPO/C&E/FMEA, and the process check is a revisit to the RPN of the FMEA. In other cases you may not have a sufficiently large sample size to conclude, e.g. 2 proportions sometimes require thousands of samples, so the answer is no: not mandatory.

  Hypothesis Testing in DMAIC
Zafar Kamal, Consultant, Canada, Member
  Dear Folke, thanks for your comment, I agree 100%. What happens if we eliminate hypothesis evaluation for any data?

  Yes - Hypothesis Testing is Needed
James
  If the solution is known, just implement it.
Otherwise DMAIC is a method to determine solutions when unknown. DMAIC uses various tools/techniques to sort out/drill down for potential causes. Then make a hypothesis ("Cause A impacts the result") and use facts/data to validate the cause before implementation. If you don't test your hypothesis the wrong potential solution may be implemented. HOW the hypothesis test is conducted may be a better question. But the idea behind hypothesis testing is valid for all DMAIC projects.

  DMAIC is a Scientific Method
Manuel Razo
  (...)


  Decision Making on an Incomplete Data Base
Jens Folke, Consultant, Denmark, Member
  (...)

  Depends on Cost and Benefits of Implementation
Jagdish B Acharya, Consultant, India, Member
  (...)

  Hypothesis Testing in DMAIC is not Always Necessary
Georges Van Cauwenbergh, Management Consultant, Ireland, Member
  (...)


  Samples and Populations and Hypothesis Tests
Ger de Waard, Management Consultant, Netherlands, SIG Leader
  (...)

   
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