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Bears Repeating: Given Two Different Numbers...

Is it statistically significant? Who cares?

Davis Balestracci
Tue, 02/17/2015 - 12:17
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Body

I have evolved to using fewer, simpler tools in my consulting and have never been more effective, as I commented upon in my last column. It made me ponder the relevance of much of what I learned in my master’s statistics program. Thinking of the most basic concepts, I decided to look up what the American Society for Quality considers the (Six Sigma) Green Belt body of knowledge. If you click on its link, I want to draw your particular attention to: “III. Six Sigma—Measure (B, C, D),” “IV. Six Sigma—Analyze (A. B),” and “V. Six Sigma—Improve & Control (A, B).”

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In the foreword to Quality Improvement Through Planned Experimentation, by Ronald Moen, Thomas Nolan, and Lloyd Provost (McGraw-Hill, 2012)—which I believe is the best book on industrial design of experiments—Deming himself writes:

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Comments

Submitted by Rip Stauffer on Wed, 02/18/2015 - 10:22

Great, great example, Davis!

It remains as true as ever...any fool can make a trend out of two points! What does it say about those who manage using those "trends?"

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Submitted by dkhays on Mon, 02/23/2015 - 06:05

statistics

Do you suppose they got what they were looking for?  Not necessarily what the data says.  A set of numbers can be manipulated to get what you are looking for.

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