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【单选题】
在某个电视节目的收视率调查中,随机抽取由165个家庭构成的样本,其中观看该节目的家庭有33个。用90%的置信水平(注: )估计观看该节目的家庭比例的置信区间为
A.
20%±3%
B.
20%±4%
C.
20%±5%
D.
20%±6%
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