unit ix comparative statistical methods ii: 2-sample tests ... · unit ix comparative statistical...
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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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