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Zafar Kamal
Consultant, Canada
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Hypothesis Testing in DMAIC Projects
Is hypothesis testing a must in DMAIC projects? Why (not)?
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Jens Folke
Consultant, Denmark
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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.
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Zafar Kamal
Consultant, Canada
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Hypothesis Testing in DMAIC
Dear Folke, thanks for your comment, I agree 100%. What happens if we eliminate hypothesis evaluation for any data?
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James, United States
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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.
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Manuel Razo, Philippines
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DMAIC is a Scientific Method
DMAIC and scientific method are one and the same. ...
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James, United States
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DMAIC is not only a Scientific Method
DMAIC uses scientific methods, but involves more s...
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Jens Folke
Consultant, Denmark
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Decision Making on an Incomplete Data Base
You have reduced the error rate from 5 in 180 til ...
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Jagdish B Acharya
Consultant, India
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Depends on Cost and Benefits of Implementation
Normal test of significance in hypothesis testing ...
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Georges Van Cauwenbergh
Management Consultant, Ireland
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Hypothesis Testing in DMAIC is not Always Necessary
KISS... And by keeping it simple and having data f...
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James, United States
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Data Always Leads to Statistics
@Georges Van Cauwenbergh: Except when only provide...
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Ger de Waard
Management Consultant, Netherlands
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Samples and Populations and Hypothesis Tests
Why do we even need hypothesis tests? After all, w...
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