根据中心极限定律以及t分布,95%置信区间的范围基本等于:sample mean
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48 median 52.61 q1 79.64 trmean 57.13 q3 stdev se mean
sqrt(sample_size) # 绘制正态分布的pdf norm = scipy.stats.
interval estimation of a population mean: large-sample ca e
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