1.31 在置信度为0.95下,总体X的期望μ的置信区间为[a,b ],其中a,b均为样本x1,x2,···,xn的函数,则区间[a-|||-bigcirc alt mu lt b =0.95-|||-bigcirc alt xlt b =0.95-|||-bigcirc alt xlt b =0.95-|||-bigcirc alt overline {x)-mu lt b} =0.95