what`s the difference between cluster sampling and multi-stage s...

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整群抽样 (Cluster sampling)整群抽样是将总体中各单位归并成若干个互不交叉、互不重复的集合，称之为群；然后以群为抽样单位抽取样本的一种抽样方式。整群抽样应用整群抽样时，要求各群有较好的代表性，即群内各单位的差异要大，群间差异要小。整群抽样的优点是实施方便、节省经费，特别适用于缺乏总...

关于市场调查的选择题2(英文的) 兄弟姐妹们谁能给我答案啊

a.The difference between sample result and the result of a census conducted using identical procedures.b.An error resulting from some imperfect aspect of the research design.c.Statistical fluctuations.d.Random sampling error.答案是B（B选项是systematic error的一个方面）13.Which of the fo...

be difference in much difference cluster sample randomsampling have difference sampling error a difference no difference difference什么时候加s