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【多选题】
假设总体为非正态分布,从该总体中抽取容量为100的样本,则样本均值的抽样分布( )。A.
服从正态分布
B.
服从T分布
C.
样本均值的期望等于总体均值
D.
样本均值的标准差等于总体标准差除以100的平方根
E.
样本均值的方差等于总体方差除以100的平方根
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皮皮学刷刷变学霸
举一反三
【单选题】I watched the man for a long time and wanted to know .
A.
whether I have seen him before
B.
where I had seen him before
C.
that I had seen him before
D.
when did I see him
【单选题】I kept looking at the man, wondering _______.
A.
whether I have seen him before
B.
whether I had seen him before
C.
that I had seen him before
D.
when I saw him before
【单选题】It was no use______ that I had not seen him, so I waved to him.
A.
to pretend
B.
pretending
C.
pretended
D.
being pretend
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