3.设(X1,X2,X3,X4,X 5)为正态总体N (0,1)的样本,试确定c,使随机变量 Y=-|||-dfrac (c({X)_(1)+(X)_(2))}(sqrt {{{X)_(3)}^2+({X)_(4)}^2+({X)_(5)}^2}} 服从t分布.

5.设X1,X2,X3,X4是总体 sim N(0,1) 的简单随机样本,则 =dfrac (sqrt {3)(X)_(1)}(sqrt {{{X)_(2)}^

设样本X1,X2,X3,X4,X5来自总体N(0,1),设样本X1,X2,X3,X4,X5来自总体N(0,1),设样本X1,X2,X3,X4,X5来自总体N(0

设X1,X2,X3,X4,X5是来自正态总体X1,X2,X3,X4,X5的样本.(1) 求C使统计量X1,X2,X3,X4,X5服从X1,X2,X3,X4,X5

10.设总体 sim N(0,1), X1,X2,X3是来自X的样本,则 =dfrac (sqrt {3)X}(sqrt {{{X)_(1)}^2+({X)_(

15.设总体 approx N(0,1), (X1,X2,X3,X4,X5,X6)为样本,另设-|||-=(({X)_(1)+(X)_(2))}^2+(({X)

单选题设(X1,X2,X3,X4,X5)为总体(X1,X2,X3,X4,X5)的样本,(X1,X2,X3,X4,X5)服从F分布,其中c为常数,则c= (

(2)设样本X1,X2,···,X5来自总体N (0,1), =dfrac (C({X)_(1)+(X)_(2))}({({{X)_(3)}^2+({X)_(4

(2)设样本X1,X2,···,X5来自总体N (0,1), =dfrac (C({X)_(1)+(X)_(2))}({({{X)_(3)}^2+({X)_(4

设X1,X2,X3是来自正态总体X1,X2,X3的样本，若X1,X2,X3，则常数C=_____。设是来自正态总体的样本，若，则常数C=_____。

4.第六章4(1),设样本x1,x2 x1,x4,x4,x,来自总体N(0,1), =(({x)_(2)+(x)_(2)+(x)_(2))}^2+(({x)_(