问题
单项选择题
先将总体各单位按一定的标准分成许多群，然后按随机原则从这些群中抽取若干群作为样本是（）。
A.简单随机取样法
B.系统随机取样法
C.分层随机取样法
D.整群随机取样法
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
先将总体各单位按一定的标准分成许多群，然后按随机原则从这些群中抽取若干群作为样本是（）。
A.简单随机取样法
B.系统随机取样法
C.分层随机取样法
D.整群随机取样法
参考答案：D
| 选用所给句子完成对话。 | |
| A: We have to meet the others at 8: 30 at the reserve (自然保护区), don't we? B: (1) ________ A: Do you know how to get there? B: (2) ________It'll take us about two hours to get there by bus. A: (3) ________ B: It's an area that protects lots of different animals. A: (4) ________ B: I'm not really sure. I know there are many different kinds of birds there and I'm going to take my camera with me. A: (5) ________ What clothes are you going to wear? B: Well, if it's wet, I'll wear my strong shoes and take my raincoat with me. A: So I will.
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