If a distribution of interval scores is badly skewed, the scores should be ranked and ordinal tests performed.

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If a distribution is badly skewed, it may violate the assumption of normality required for many parametric tests. In such cases, it is recommended to rank the scores and perform nonparametric tests, which are based on the ordinal relationship between the scores rather than their specific values. Examples of nonparametric tests include the Wilcoxon rank-sum test, the Kruskal-Wallis test, and the Spearman correlation coefficient.

If a Distribution of Interval Scores Is Badly Skewed, the Scores