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Mean quality rating - PowerPoint PPT Presentation

- Statistical Analysis 2 -

Topic 9 - Statistical Analysis 2 - T-test & Z-test Deal with only one metric question Test the hypothesis about the mean Whether to use T-test or Z-test? Depend on the sample size If n>30, use Z-test If n<30, use T-test Determine whether the test is one-tailed or two-tailed

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Mean quality rating - PowerPoint PPT Presentation

- Statistical Analysis 2 -