What are non-parametric tests? Explain giving examples. What is the purpose of non- parametric tests?

Non-parametric tests are statistical tests that do not assume a specific distribution for the data. Unlike parametric tests, which rely on assumptions about the population (such as normality), non-parametric tests are used when these assumptions cannot be met or when the data is ordinal, nominal, or not measured on an interval scale. They are _______ ______ _______ __________ _________.
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