Based on the definition of the confidence interval, using the methed of numerical calculation, the minimum length of confidence interval for the variance of the normal distribution are found.
99,在样本容量n从3到30的范围内,在正态总体均值未知的情形下,求得了方差σ2的最短置信区间,并对用通常方法求得的置信区间的长度与最短置信区间的长度进行了对比分析。