抽样调查必然会出现抽样误差,减少抽样误差应注意
A.恰当地确定母体的数目
B.恰当地确定样本的数目
C.正确地确定抽选样本的方法
D.正确地确定抽选样本的费用和时间
E.加强抽样调查的组织工作,提高工作质量
正确答案是BCE
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History of the Great Wall of ChinaThe Great Wall of China is a UNESCO heritage site, and stretches 13,171 miles. It is probably the first thing tourists think about when they visit China. People know it is huge a
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