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Why can’t the woman sleep well? A、She has worked too hard. B、She is afraid that the she will lose the opportunity. C、She can’t remember all the words in her resume D、She fears that she will lose the job again.
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某化纤强力长期以来标准差稳定在，现抽取一个容量为的样本，求得样本均值，则求该化纤强力均值的置信水平为0.95的置信区间为。（ ）A.对B.错
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