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税务管理官员认为,大多数企业都有偷税漏税的行为。在对由800个企业构成的随机样本的检查中,发现有144个企业有偷税漏税的行为。根据99%的置信水平估计偷税漏税企业比例的置信区间为( )
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从一个正态总体中随机抽取一个容量为100的样本,其均值和标准差分别为81和12。构造总体均值的99%的置信区间为( )
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