To test differences in means between two or more groups, we need to ensure that the variable we are taking the mean of is ordinal-scaled.

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To test differences in means between two or more groups, we need to ensure that the variable we are taking the mean of is interval or ratio-scaled. Ordinal scaling only allows for rank ordering of values and does not provide equal intervals for meaningful comparisons of means.

To Test Differences in Means Between Two or More Groups