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简答题设有一组来自正态总体的样本观测值: 0.497,0.506,0.518,0.524,0.488,0.510,0.510,0.515,0.512, ⑴已知,求的置信区间(设置信度为0.95) ⑵未知,求的置信区间(设置信度为0.95)
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