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, United States

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, Philippines

DMAIC is a Scientific Method

DMAIC and scientific method are one and the same. So hypothesis testing is a must.... Sign up

James, United States

DMAIC is not only a Scientific Method

DMAIC uses scientific methods, but involves more such as risk and change management.... Sign up

Jens Folke
Consultant, Denmark

Decision Making on an Incomplete Data Base

You have reduced the error rate from 5 in 180 til 3 in 200. A 2-proportion test is not significant, ... Sign up

Jagdish B Acharya
Consultant, India

Depends on Cost and Benefits of Implementation

Normal test of significance in hypothesis testing has 5% and 1% constants. In terms of deviation thi... Sign up

Georges Van Cauwenbergh
Management Consultant, Ireland

Hypothesis Testing in DMAIC is not Always Necessary

KISS... And by keeping it simple and having data for the total population (which by the way is not t... Sign up

James, United States

Data Always Leads to Statistics

@Georges Van Cauwenbergh: Except when only provided one data point, we always use statistics to desc... Sign up

Ger de Waard
Management Consultant, Netherlands

Samples and Populations and Hypothesis Tests

Why do we even need hypothesis tests? After all, we took a random sample and our sample mean of 325.... Sign up


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