Hypothesis Testing in DMAIC Projects

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Zafar Kamal
Consultant, Canada

Hypothesis Testing in DMAIC Projects

Is hypothesis testing a must in DMAIC projects? Why (not)?

  Jens Folke
Consultant, Denmark
 

Hypothesis Testing in DMAIC?

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.

  Zafar Kamal
Consultant, Canada
 

Hypothesis Testing in DMAIC

Dear Folke, thanks for your comment, I agree 100%. What happens if we eliminate hypothesis evaluation for any data?

  James
 

Yes - Hypothesis Testing is Needed

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.

  Manuel Razo
 

DMAIC is a Scientific Method

DMAIC and scientific method are one and the same. (...)

  James
 

DMAIC is not only a Scientific Method

DMAIC uses scientific methods, but involves more s (...)

  Jens Folke
Consultant, Denmark
 

Decision Making on an Incomplete Data Base

You have reduced the error rate from 5 in 180 til (...)

  Jagdish B Acharya
Consultant, India
 

Depends on Cost and Benefits of Implementation

Normal test of significance in hypothesis testing (...)

  Georges Van Cauwenbergh
Management Consultant, Ireland
 

Hypothesis Testing in DMAIC is not Always Necessary

KISS... And by keeping it simple and having data f (...)

  James
 

Data Always Leads to Statistics

@Georges Van Cauwenbergh: Except when only provide (...)

  Ger de Waard
Management Consultant, Netherlands
 

Samples and Populations and Hypothesis Tests

Why do we even need hypothesis tests? After all, w (...)

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