The Kruskal-Wallis test is a non-parametric statistical test used in Six Sigma to compare the medians of three or more independent groups. It is an extension of the Mann-Whitney U test and is used when the data does not meet the assumptions of normality required for ANOVA. The test ranks all the data points from all groups together and then compares the sum of ranks between the groups. By assessing whether there are statistically significant differences in the medians, the Kruskal-Wallis test helps identify factors that impact process performance, guiding data-driven decisions and process improvements.
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