题目内容：
设X1,X2,…,X6是来自N(u,02)的样本,S2为其样本方差,则DS2的值为( A)1/3 o 4. : ( B ) 1/5fo . : ( C)2/5 o4 : (D).
参考答案：
选择题：设X1,X2,…,X6是来自N(u,02)的样本,S2为其样本方差,则DS2的值为( A)1/3 o
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( A)1/3 o 4. : ( B ) 1/5fo . : ( C)2/5 o4 : (D).
( A)1/3 o 4. : ( B ) 1/5fo . : ( C)2/5 o4 : (D).
已知F0.1(8,20)=2,则F0.9(20,8)=1
已知F0.1(8,20)=2,则F0.9(20,8)=1
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设A,B为两个事件,且BCA,则下列各式中正确的是()( A ) P ( AUB ) = P ( A ) : ( B ) P ( AB ) = P ( A )
设X~N(2,1),Y~N(-1,1),且X,Y独立,记Z=3X-2Y-6,则Z ~ ( A ) N
设X~N(2,1),Y~N(-1,1),且X,Y独立,记Z=3X-2Y-6,则Z ~ ( A ) N ( 2 , 1 ) : ( B ) N ( 1 , 1 )