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Unformatted text preview: AMS 572 Lecture Notes 7 Oct. 1 st , 2010 (* Please check your lecture notes for solutions to Quiz 2.) Ch8 Inference on two population means (and two population variances). 1. The samples are paired paired sample ttest 2. The samples are independent independent sample ttest a) 2 2 1 2 = pooledvariance ttest b) 2 2 1 2 unspooledvariance ttest (Note: to check if 2 2 1 2 = , use Ftest) 1. Inference on two population means: Paired samples: e.g. Compare the IQ between adult male and female Pair IQ Male IQ Female Diff 1 200 199 1 2 150 120 30 n 109 1123 *** After taking the paired differences make sure you use one variable to subtract the other, consistently the two population/sample problem reduced to a one population/ one sample problem on the population/sample of the paired differences 1 : : male female a male female H H = : : diff a diff H H = : : male female a male female H H = < : : diff a diff H H = < : : male female a male female H H = : : diff a diff H H = SAS code: data twins; input IQmale IQfemale; diff= IQmaleIQfemale; datalines ; 200 199 150 120 ......
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 Fall '10
 WeiZhu

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