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X X1 X2 X1 Y Y1y2 Y1
Y-y1/x-x1 Y2-y1/x2-x1
X2/x1+x1/x2
设总体 X N 1 2 2 X1 X2 xn 为 X 的一个样本 则
X X1
X X1 X2是行向量还是列向量
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