摘要
针对用标准偏差估算公式对偏差的平方取平均值时为什么除n - 1而不除n(n为测量次数 )的问题 ,用数理统计学的观点作了数学证明 。
In obtaining the average value of the square deviation with the estimation formula of standard affect, why is it divided by n-1 instead of n? (n stands for the survey times) Concerning this question, this paper gives an mathematical explanation from a statistical angle, thus offering some help to the teaching of related parts in engineering experiment courses.
出处
《江南学院学报》
2001年第4期97-100,共4页
Journal of Jiangnan College
