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血糖： sigma = 25 mg/dL（来自历史研究）。若要在95%的置信水平下，误差限不超过5 mg/dL，最小样本量 n 是多少？
血糖： sigma = 25 mg/dL（来自历史研究）。若要在95%的置信水平下，误差限不超过5 mg/dL，最小样本量 n 是多少？
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