Math Anxiety, Dyscalculia and Six Sigma

In our Black Belt program, we make extensive use of Minitab statistical software.  The software performs the actual mathematical calculations, relieving the student of the burden of knowing how to do them using paper and pencil.   To use Minitab effectively, students must be able to choose the appropriate test or analysis to perform for a […] read more

When Is a Change an Improvement?

One of my Black Belt students recently submitted an interim project report. The goal of her project is to reduce the time it takes to complete a certain transaction. The project Y metric is success rate, where a success is defined as completing the transaction in 24 hours or less. The goal after improvement is […] read more

Pairwise Ranking: A Six-Step Approach to Evaluating Alternatives

In the Improve phase of a Six Sigma project, we typically need to choose between two or more potential solutions to a problem.  There are several tools to help in making this decision, one of which is pairwise ranking.   Pairwise ranking is used by individuals or teams to qualitatively prioritize a list of alternatives.  There […] read more

Statistical Significance and Practical Significance

When we work on process improvement, we need to check our results to see if the output of the process was changed for the better.  There are two ways to evaluate the results, practical significance and statistical significance.  We need to verify that the results are significant in both respects.  At the risk of stating […] read more