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【单选题】
Which child was supposed to be raised in better environments?A.
The child of a never-married mother.
B.
The child from a two-parent family.
C.
The child whose father had divorced his wife and remarried.
D.
The child whose father had divorced his wife but not remarried.
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举一反三
【单选题】在总体均值μ的区间估计巾，下列正确的说法是( )。
A.
置信度1-α一定时，样本容量增加，则置信区间的长度变长；
B.
置信度1-α一定时，样本容量增加，则置信区间的长度变短；
C.
置信度1-α变小，则置信区间的长度变短；
D.
置信度1-α变大，则置信区间的长度变短。
【多选题】设[θL，θU]是θ的置信水平为1-α的置信区间，则有( )。
A.
α越大，置信区间长度越短
B.
α越大，置信区问长度越长
C.
α越小，置信区间包含θ的概率越大
D.
α越小，置信区间包含θ的概率越小
E.
置信区间长度与α大小无关
【多选题】设[θ，θu]是口的置信水平为1-a的置信区间，则有( )。
A.
a越大，置信区间长度越短
B.
θ的点估计θ落在[θL，θU]中
C.
P(θL≤θ≤θU)≥1-a
D.
a越小，置信区间包含目的概率越小
E.
置信区间长度与a大小无关．
【单选题】我是安保部经理， 将协助这次安保工作
A.
I’m a manager of the enterprise, who will assist you in this security department
B.
I’m a manager of the security department. , who will assist you in this security work
C.
The security manager who will assist you in this security work, is on the way
D.
The security work will be assisted by the manager of the security department
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