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Unformatted text preview: two-tailed test: H : 1 = 2 H 1 : 1 2 . We decide on alpha, and we find the critical value of t (t critical ) for degrees of freedom n 1 +n 2-2. We will only use the t-distribution (not the z-distribution). We then compute t calculated . If we assume that our population standard deviations are not equal across the two populations, then we use this formula: Finally, we compare t calculated to t critical . If t calculated is farther from 0 than t critical then we reject the null hypothesis. 1 1 2 2 2 1 2 1 2 1-+--= n s n s x x t CALCULATED...
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- Spring '09