When is a signed rank test used?
A signed rank test is a non-parametric statistical method used to compare two related samples or paired data when the assumptions of the parametric test, such as normality and equal variances, are not met. This test is used when the data is ordinal, interval, or ratio but not normally distributed. It is commonly used in medicine, psychology, and social sciences to analyze data from small samples or non-normal distributions. In essence, it is used when a paired t-test is inappropriate.
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