Unit IXComparative Statistical Methods II:

2-Sample Tests

2-sample 2-test (>2 categories)2-sample z-test of proportions

1. Nominal Data

Mann-Whitney U-test2. Ordinal Data

a) paired samplesb) independent samples

Student’s t-test of means3. Interval/Ratio Data

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Nominal Data: 2-Sample 2 test

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Nominal Data: 2-Sample z-test of proportions

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Ordinal Data: Mann-Whitney U-test

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Ordinal Data: Mann-Whitney U-test (ties)

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Interval/Ratio Data: Independent Samples t-test

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Interval/Ratio Data: Paired Samples t-test

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