题目内容：
分层抽样是将总体先分为若干群，然后成群地随机抽取样本单位。
答案解析：
判断题：分层抽样是将总体先分为若干群，然后成群地随机抽取样本单位。
- 题目分类：统计学和统计法基础知识
- 题目类型：判断题
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Which of the following is TRUE according to the passage?
Which of the following is TRUE according to the passage?
The word“affected”in para.3 means _________.
The word“affected”in para.3 means _________.
It can ___________ (believE．that there is no life without wa
It can ___________ (believE．that there is no life without water.
The question is ________ me and I have no idea of it.
The question is ________ me and I have no idea of it.
对马先生家庭的财务状况预测不正确的是（ ）。
对马先生家庭的财务状况预测不正确的是（ ）。