1.3.5.3. Two | two sample t test
![1.3.5.3. Two](https://i.imgur.com/axBPWDg.jpg)
Purpose:TestiftwopopulationmeansareequalThetwo-samplet-test(SnedecorandCochran,1989)isusedtodetermineiftwopopulationmeansareequal.Acommonapplicationistotestifanewprocessortreatmentissuperiortoacurrentprocessortreatment.Thereareseveralvariationsonthistest.Thedatamayeitherbepairedornotpaired.Bypaired,wemeanthatthereisaone-to-onecorrespondencebetweenthevaluesinthetwosamples.Thatis,ifX1,X2,...,XnandY1,Y2,...,Ynarethetwosamples,thenXicorrespondstoYi.Forpairedsamples,thedifferenceXi-Yiisusuallycal...
![1.3.5.3. Two](https://i.imgur.com/H8YKUrg.jpg)
There are several variations on this test.
The data may either be paired or not paired. By paired, we mean that there is a one-to-one correspondence between the values in the two samples. That is, if X1, X2, ..., Xn and Y1, Y2, ... , Yn are the two samples, then Xi corresponds to Yi. For paired samples, the difference Xi - Yi is usually calculated. For unpaired samples, the sample sizes for the two samples may or may not be equal. The formulas for paired data are somewhat simpler than the formulas ...取得本站獨家住宿推薦 15%OFF 訂房優惠
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1.3.5.3. Two | two sample t test
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