正态分布数据认为，样本中约68%的数值分布在距离平均值为1的标准偏差之内。
Normally distributed data assumes that about 68% of the values in the sample are within 1 standard deviation of the mean.
抽样分布的标准偏差。统计学上用来说明从样本预测的数据的准确性。
The standard deviation of a sampling distribution. It is the statistic used to make statements about the accuracy of estimates based on sample information.
实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。
It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.
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