总体经过分类后，若类内方差较大而类间方差较小，则适用于（）。_爱下问搜题

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问题单项选择题

总体经过分类后，若类内方差较大而类间方差较小，则适用于（）。

A.简单随机抽样

B.分类抽样

C.整群抽样

D.等距抽样

答案

参考答案：C

填空题

选词填空。
根据句意,请用方框中词语的适当形式完成下列句子,每词只用一次。

Chemistry tire comfortable excite prepare hope eventual impress present advertise

1. I have met him twice, but I don’t have a good ______________ of him.
2. He is experimenting with a new ______________.
3. Last summer I worked for six weeks as a _____________ on a children’s TV show.
4. Let’s have a rest for a few minutes – this work very ___________.
5. __________, she got a job and moved to London.
6. The news that she had won the first prize caused great __________ among her friends.
7. His eyes fell upon an ____________ in the magazine.
8. The country is making ______________ for a war.
9. Getting lost in the forest, I felt lonely and _____________.
10. I couldn’t fall asleep because the bed was so _______________.

填空题

在同一平面内（）的两条直线叫做平行线。平行线间的距离处处（）。