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【多选题】
某批产品共计有 4000 件,为了了解这批产品的质量,从中随机抽取 200 件进行质量检验,发现其中有 30 件不合格。根据抽样结果进行推断,下列说法正确的有( )A.
n=200
B.
n=30
C.
总体合格率是一个估计量
D.
样本合格率是一个统计量
E.
合格率的抽样平均误差为 2.52%
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