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12-配对样本均值差的检验统计量.Rmd

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# 配对样本均值差的检验统计量 {#Chp12}

记$D=X_A-X_B$。若此时$X_A$与$X_B$无差异，则$D$服从于一均值为0的正态分布。构造检验统计量

$$T_0=\frac{\overline D}{S_D⁄\sqrt n}\sim t(n-1)$$

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