题目内容

如果采用分层抽样，从个体数为N的总体中抽取一个容量为n样本，那么每个个体被抽到的可能性为（）。

A. 1/N
B. 1/n
C. n/N

查看答案

搜索结果不匹配？点我反馈

更多问题

随机抽样的类型有（）。

A. 简单随机抽样
B. 分层随机抽样
C. 分群随机抽样
D. 判断抽样
E. 任意抽样

抽样调查的优点有（）。

A. 工作量小
B. 调查费用低
C. 时间短
D. 推论总体无误差
E. 调查费用高

After learning the prefix un-, suffix -ant and -ify, now try to fill in the blanks with the words in the bracket. Change the form where necessary.1. Despite being________(class) as a meat-eater, the panda has a diet that is overwhelmingly vegetarian.

2. They have developed computerized systems which will greatly _______ (assistant) all library users so that they will not need the help of others.