设1和2都是总体X的样本X1,X2,···,xn的函-|||-数,如果满足(),则称随机区间 () () 2)是未知参数-|||-θ的置信度为95%的置信区间.-|||-A {theta )_(1)lt theta } =0.95-|||-B) (theta lt (theta )_(2))=0.95-|||-C {theta )_(1)lt theta lt (theta )_(2)} =0.05-|||-D {theta )_(1)lt theta lt (hat {theta )}_(2)} =0.95