The Mann-Whitney U test, also known as the Wilcoxon rank-sum test, is a non-parametric statistical test used in Six Sigma to compare differences between two independent groups. It assesses whether the distribution of ranks in one group is significantly different from the other, making it suitable for ordinal data or when the assumptions of the t-test are not met. This test does not assume normal distribution and is robust to outliers. The Mann-Whitney U test helps determine if there is a significant difference in medians between the groups, aiding in process improvement and decision-making by providing insights into data behavior.
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