题目
设总体X~ N(0,1),X1 , X2,…, X6为来自总体X的样本,=(({X)_(1)+(X)_(2)+(X)_(3))}^2+(({X)_(4)+(X)_(5)+(X)_(6))}^2,若CY~χ2分布,则C=( )A. =(({X)_(1)+(X)_(2)+(X)_(3))}^2+(({X)_(4)+(X)_(5)+(X)_(6))}^2 B. =(({X)_(1)+(X)_(2)+(X)_(3))}^2+(({X)_(4)+(X)_(5)+(X)_(6))}^2 C. =(({X)_(1)+(X)_(2)+(X)_(3))}^2+(({X)_(4)+(X)_(5)+(X)_(6))}^2 D. =(({X)_(1)+(X)_(2)+(X)_(3))}^2+(({X)_(4)+(X)_(5)+(X)_(6))}^2
设总体X~ N(0,1),X1 , X2,…, X6为来自总体X的样本,
,若CY~χ2分布,则C=( )
B.
C.
D.
题目解答
答案
B. $\dfrac {1}{3}$