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【单选题】
从同一总体中随机抽取多个样本,分别估计总体均数的置信区间,则精确度高的是
A.
均数大的样本
B.
均数小的样本
C.
可信度和n不变,标准差大的样本
D.
可信度不变,标准误大的样本
E.
n、s不变,可信度减小的样本
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