组距分组资料方差计算公式修正形式

Correction of Calculation Formula for Calculating Variance of Grouping Data Within Distances in Statistics

提出统计学中的组距分组资料方差和标准差计算公式误差问题 ,由方差的加法定理和均匀分布方差给出分组资料方差计算和标准差计算的修正公式具体形式 ,并就均匀分布数列和正态分布数列组内方差平均数进行了讨论 .

The problem of the error of calculation formula calculating the variance of grouping data within distances in statistics was put forward,and the concrete forms of correcting formula were given by the theorem of addition and the variance of even distribution.As examples,the average variances inside groups of even distribution and normal distribution were discussed.