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Inferences for Two Population Means [Cement Hydration]
Xb=90;sx=5;m=10; Yb=87;sy=4;n=15; sigmah=sqrt(((m-1)*sx^2+(n-1)*sy^2)/(m+n-2)); sigmab=sigmah*sqrt(1/m+1/n); alpha = 0.05; zstar = qt(1-alpha/2,m+n-2); SE=zstar*sigmab; dif=Xb-Yb Z1=dif+SE; Z2=dif-SE; #Answer dif sigmah sigmab SE Z1 Z2
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