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Difference from before and after treatment Mean Type of Number of (change in Standard Trial Treatment Participants (n) cholesterol) Deviation Trial A Placebo 1000 132.5

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Difference from before and after treatment Mean Type of Number of (change in Standard Trial Treatment Participants (n) cholesterol) Deviation Trial A Placebo 1000 132.5 14.7 Drug A 1000 120.7 12.3 What is the confidence interval?|(n1 - 1)s, + (n2 - 1)$2 (X, - X, ) + +* Sp. + Sp = n1 + 2 - 2 n2

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