
【名词&注释】
分层抽样方法
[填空题]将一个总数为 A、B 、C 三层,其个体数之比为5:3:2。若用分层抽样方法抽取容量为100的样本,则应从C 中抽取_________ 个个体。
查看答案&解析
举一反三:
[单选题]53____
A. rollin
B. floating
C. drawing
D. flashing
[单选题]Joseph to evening classes since last month ,but he still can’t say “what’s your name ?”in Russian
A. has been going
B. went
C. goes
D. has gone
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