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某测量仪器的 sigma = 15 个单位(已知)。若要以95%的置信水平、最大误差限3个单位估计均值,最小样本量 n 是多少?
某测量仪器的 sigma = 15 个单位(已知)。若要以95%的置信水平、最大误差限3个单位估计均值,最小样本量 n 是多少?
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