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【简答题】
设（X1,X2,...Xn）是来自正态总体N(μ,σ^2）的一个样本,记Y1=1/6(X1+X2+…+X6),Y2=1/3(X7+X8+X9), 9，S^2=1/2∑(Xi-X2)^2,Z=√2(Y1-Y2)/S，i=7 求统计量Z的分布
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