The t-test is not appropriate for ordinal data or if the populations examined are not believed to be approximately normally distributed and other methods such as the Wilcoxon test can be used.

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The t-test assumes that the data are continuous and normally distributed, making it inappropriate for ordinal data or non-normally distributed populations. In such cases, non-parametric tests like the Wilcoxon test are more suitable.

The T-Test Is Not Appropriate for Ordinal Data or If