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12. Comparing the equal-variances and Welch t-tests. (a) Show that if ni = n2, then the test statistics for the equal-variances and Welch two sample
12. Comparing the equal-variances and Welch t-tests. (a) Show that if ni = n2, then the test statistics for the equal-variances and Welch two sample t-test are equal. (b) Show that the df for the Welch t-test is always less than or equal to the df for the equal- variances t-test. When are they equal
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