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Chapter 8. Formatting Variables, Recodin... > 8.7 Case Study 1: Is the Two-Sample ...
8.7 Case Study 1: Is the Two-Sample t-Test Robust Enough for Heterogeneous Variances?
Statistical procedures are derived assuming certain underlying characteristics. For example, the pooled variance t-test of the equality of two population means (i.e., H0: μ1=μ2) assumes that the observations from the two populations are independent and that the two populations are normally distributed with a common variance. This test takes the following general form:
