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【单选题】
由两样本均数的差别推断两总体均数的差别，得到此差别具有统计意义的结论是指A.
两样本均数差别有显著性
B.
两总体均数差别有显著性
C.
两样本均数和两总体均数的差别都有显著性
D.
其中一个样本均数和它的总体均数差别有显著性
E.
以上都不是
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A.
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B.
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C.
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