Unformatted text preview: twotailed test: H : µ 1 =µ 2 H 1 : µ 1 ≠µ 2 . We decide on alpha, and we find the critical value of t (t critical ) for degrees of freedom n 1 +n 22. We will only use the tdistribution (not the zdistribution). 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
 Kupchick
 Statistics, Standard Deviation, Null hypothesis, Hypothesis testing, Statistical hypothesis testing

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