摘要
通过计算 ,验证了标准偏差的标准偏差公式误差很小。在n =3 ,4,5 ,相对误差E =7 9% ,5 0 % ,3 6% ;当n≥ 14 ,E≤ 1%
By calculating,the author proves the errors of the formula of standard deviation from standard deviation is very small When n=3,4,5,relative errors E are 7 9%,5 0% and 3 6% respectively,and from n≥14,E≤1%.
出处
《四川工业学院学报》
2002年第1期86-88,共3页
Journal of Sichuan University of Science and Technology
关键词
方差
标准偏差
X^2分布
卡方分布
相对误差
标准偏差公式
variance
standard deviation
χ 2-distribution (chi square distribution)
χ-distribution (chi distribution)
