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Unformatted text preview: Difference between Means • We test the hypothesis using the statistic : H 2 1 = μ μ  = _ 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
 Statistics, Normal Distribution, Standard Error

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