【单选题】Culture is a system of shared beliefs, values, customs, behaviors, and artifacts that the members of a society use to cope with their world and with one another, and that are transmitted from generati...
【简答题】下列关于抽样的说法正确的是( )(10.0分)A. 随机误差不可避免但是可以控制; B. 偏倚是指按照某一抽样方案反复进行抽样,估计值的数学期望与待估参数之间的离差; C. 抽样框应该尽量与目的总体尽可能一致; D. 抽样单元是构成抽样框的基本要素,抽样单元可以只包含一个个体; E. 抽样总体是指从总体中所抽取的调查单位;