研究者先把总体分为若干个同质的层(次级总体),然后用简单随机抽样或系统抽样方法,从每层中抽取样本元素,这种抽样是( )。
A.系统抽样
B.分层抽样
C.多段整群抽样
D.简单随机抽样
正确答案是B
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