Tag Archives: Six Sigma

Writing an Operational Definition for a Measure

Our Yellow Belt course includes an assignment where students are required to write an operational definition for measuring something.  An operational definition, when applied to data collection, is a clear, concise and detailed definition of a measure. The need for operational definitions is fundamental when collecting all types of data. Here is the text of […]

Statistical Software – a Trap for the Unwary

In our Six Sigma courses we make extensive use of Minitab statistical software.  Minitab is an extremely comprehensive and powerful software package.  At the same time author Milton Rosenau provided this caution when he said “(Software)…is also a trap for the unwary.” When evaluating the output of a piece of software such as Minitab, we […]

Quality Pioneers – The Evolution of Six Sigma – Fourth in a Series

One of the first assignments in our Black Belt course deals with the origins of the continuous improvement approach that we know today as Six Sigma.  Many students are surprised to learn that the body of knowledge and the tools and techniques have been evolving for well over 100 years. This article is the fourth […]

Quality Pioneers – The Evolution of Six Sigma – Third in a series

One of the first assignments in our Black Belt course deals with the origins of the continuous improvement approach that we know today as Six Sigma.  Many students are surprised to learn that the body of knowledge and the tools and techniques have been evolving for well over 100 years. This article is the third […]

Quality Pioneers – the Evolution of Six Sigma – second in a series

One of the first assignments in our Black Belt course deals with the origins of the continuous improvement approach that we know today as Six Sigma.  Many students are surprised to learn that the body of knowledge and the tools and techniques have been evolving for well over 100 years. This article is the second […]

Quality Pioneers – The Evolution of Six Sigma – First in a Series

One of the first assignments in our Black Belt course deals with the origins of the continuous improvement approach that we know today as Six Sigma.  Many students are surprised to learn that the body of knowledge and the tools and techniques have been evolving for well over 100 years. This article is the first […]

Lies and Statistics……

One of my Black Belt students recently submitted his final project report.  He used the two proportions test in Minitab to compare the proportion of on time performance for completion of employee appraisals, before and after improvement.  I sent him the following feedback regarding this test. “Hi.  Your null and alternate hypotheses are correctly stated.  […]

The Central Limit Theorem

Although the central limit theorem can seem abstract and devoid of any practical application, this theorem is actually quite important to the practice of statistics.  As we will see, this theorem allows us to make some assumptions about a population. In order to understand the basis for the Central Limit Theorem, consider a population of […]