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Paired t-test [Shear Strength of Girder]
x = c(1.186, 1.151, 1.322, 1.339, 1.200, 1.402, 1.365, 1.537, 1.559) y = c(1.061, 0.992, 1.063, 1.062, 1.065, 1.178, 1.037, 1.086, 1.052) qt(0.025,9-1,lower.tail=FALSE) # not between the range -> ReJECT pt(6.0819,9-1,lower.tail=FALSE) # less than 5% -> ReJECT t.test(x,y,paired=TRUE,alternative = "two.sided") #ReJECT
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