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## Nonparametric Tests

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**Nonparametric Tests**• Nonparametric tests are those that do not rely on probability distributions for population parameters • They are used when • Data are badly skewed • Sample sizes are small • Data are not on an interval or ratio scale**Chi-Square and Goodness of Fit Test**• Chi-square tests assess the differences in frequencies of two or more categories • This is commonly referred to as a goodness of fit test • Formula for a goodness of fit test**Interpreting a χ2**• Chi-squares are interpreted by comparing the obtained value from the formula to a critical value obtained from a table