Concrete is the backbone of modern construction. But what happens when the quality of cement begins to fail, and the concrete doesn’t set on time? This isn’t just a nuisance. Delays can cause costly project delays, quality issues, and even safety risks. Introduction: A Hypothetical DMAIC Case Study Inspired by Readers This article presents a (more…)
Chi-Square Variance Test: The Definitive Guide for Six Sigma Practitioners The chi-square variance test is an essential statistical tool in the Six Sigma toolkit, used to test hypotheses about the variability of a process. Whether you are verifying a supplier’s claim, evaluating the impact of a process improvement, or assessing consistency, understanding how to apply (more…)
The chi-square test of independence (also called a chi-square test of association) determines whether two categorical variables are statistically independent of each other. In Six Sigma, this is extremely useful for analyzing contingency tables. For example, you might want to see if defect occurrence is independent of the shift, or if customer satisfaction ratings are (more…)
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