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ASQ Certified Six Sigma Black Belt (CSSBB) Exam

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A Six Sigma Black Belt is analyzing customer satisfaction scores (on a 1-10 scale) for three different service centers (A, B, C). The data is not normally distributed, and a test for equal variances has failed. Which non-parametric test is most appropriate to determine if there is a statistically significant difference in the median satisfaction scores among the three centers?
Correct Answer:
Kruskal-Wallis Test

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