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Inferences for Two Population Means [Example I - void volume within a textile fabric]
Xb=51.71;sx=0.79;m=10; Yb=136.14;sy=3.59;n=10; SE=sqrt(sx^2/m+sy^2/n) v=SE^4/((1/(m-1)*(sx^2/m)^2)+(1/(n-1)*(sy^2/n)^2)) sigmah=sqrt(((m-1)*sx^2+(n-1)*sy^2)/round(v)); sigmab=sigmah*sqrt((sx^2/m)+(sy^2/n)); alpha = 0.05; zstar = qt(1-alpha/2,round(v)); Er=zstar*sigmab; dif=Xb-Yb Z1=dif-Er; Z2=dif+Er; #Answer dif v round(v) SE zstar sigmah sigmab SE Z1 Z2
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