When ordinal scaled data are collected,statistical procedures developed for use with interval or ratio data should be used.

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Statistical procedures developed for use with ordinal data are different from those developed for interval or ratio data. Ordinal data have a ranking order, but the magnitude of differences between levels is not well-defined, making it inappropriate to use interval or ratio-based methods. Instead, non-parametric methods such as Mann-Whitney U test or Kruskal-Wallis test are recommended to analyze ordinal data.

When Ordinal Scaled Data Are Collected,statistical Procedures Developed for Use