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Choosing between Welch's t-test, data transformation, and non-parametric tests like Mann-Whitney U is a critical decision that affects your p-values and publication chances. While standard t-tests often fail due to unequal variances, blindly switching to non-parametric tests can kill your statistical power. This guide simplifies the decision process, explaining why Welch's t-test should be your default and when to truly embrace ranking methods.