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B 、 2B一般削成楔形,用于( )。
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整群抽样
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【多选题】常用的随机抽样方法有 ( )
A.
单纯随机抽样
B.
系统抽样
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分层抽样
D.
整群抽样
【简答题】常用的随机抽样方法有() A.简单随机抽样 B.等距抽样 C.分层抽样 D.整群抽样 E.多段抽样
【多选题】常用的随机抽样方法有 ( )
A.
纯随机抽样
B.
分层随机抽样
C.
等距抽样
D.
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