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Unformatted text preview: Difference between Means We test the hypothesis using the statistic : H 2 1 =  = _ 2 _ 1 _ 2 _ 1 y y SE y y t Standard Error for Hypothesis Testing Unlike the standard error for difference of proportions, the standard error for difference of means is the same as the confidence interval. What about Pooled Data? We can do a pooled ttest for the difference between the means of 2 independent groups but we will not be covering it. Work on #31 on p. 646...
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 Fall '07
 sutphin

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