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【单选题】
下面的陈述哪一个是错误的( )。A.
相关系数是度量两个变量之间线性关系强度的统计量
B.
相关系数是一个随机变量
C.
相关系数的绝对值不会大于1
D.
相关系数不会取负值
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举一反三
【简答题】设(X 1 ，X 2 ，…，X 9 )是取自正态总体N(2，3 2 )的一个样本，试求
【简答题】空间中 表示( )(三个字)
【单选题】The object (宾语)of the sentence “Chinese parents never care what the children really want because they believe that it is good for the children. ” is _________.
A.
Chinese parents
B.
what the children really want
C.
they
D.
children
【简答题】设(X 1 ，X 2 ，…，X n )是取自正态总体X～N(μ，σ 2 )的一个随机样本，其中μ未知，σ已知，试指出下列样本函数中的统计量和无偏估计量 (1) (2) (3)X 2 (4)
【单选题】.2.How does Nick Perrella treat his patients?
A.
He usually explains medical problems and then tells people some important things to do.
B.
. He only sings on his show to amuse his patients every week.
C.
He gives the medical advice in his singing.
D.
His program is only popular among the patients who enjoy his songs.
【单选题】Parents have to accept their children for ______ they are and not ______ they want them to be.
A.
who what
B.
where who
C.
what why
D.
how when
【简答题】Parents have to accept their children for ________they are and not __________they want them to be. (A)who; what (B)where; who (C) what; why (D)how; when
【判断题】设 X1, X 2, X3 是取自正态总体 X ~(mean ,s2) 的一个样本, 其中mean 已知,s 未知 ,则下列样本函数中是统计量:X1+X2+X3/3,X1/s
A.
正确
B.
错误
【单选题】People may have fewer children than they want because
A.
women are having children at a later age.
B.
they are following the example of other people.
C.
politicians want them to.
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