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Chi-square - Essay Example

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The independent t-test is a parametric test that compares scores between two unrelated groups of subjects (sometimes a control group and an experimental group). The measurements must be obtained on a continuous (interval or ratio) scale. This test should be used when it is known…
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Download file to see previous pages The chi-square goodness-of-fit test is a nonparametric test that uses the frequency distribution of a set of sample observations to make an inference about the frequency distribution of a hypothesized distribution. The measurements must be obtained on a nominal (categorical) scale. The test should be used only when parametric assumptions cannot be met (power for non-parametric tests is lower than parametric), as it does not require the fulfillment of parametric expectations. This test uses the chi-square distribution and is used to determine if there is a “fit” between the frequency distributions of the samples and the hypothesized distribution. The decision to use either the independent-t or chi-square test should be made based on the type of data collected (continuous or discontinuous) and the status of required assumptions for parametric ...Download file to see next pagesRead More
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