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问题 填空题

计算整群抽样误差与计算纯随机抽样误差的区别在于要用（）代替（）。

答案

参考答案：群间方差；总方差

名词解释

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单项选择题

More has been learned about the Moon than any other of the Earth's neighbors in space because of the Apollo program, which enabled men to walk on the Moon and bring back hundreds of pounds of ______.

A．rocks

B．rock

C．stone

D．stones
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