张老师教统计学讲解36 | 总体均值的置信区间(方差已知)
Synopsis
样本均值的抽样分布以μ 为中心，在大多数应用中，其方差小于μ 的任何其他估计量的方差。因此，样本均值将用作总体均值μ 的点 ...
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