29.设有来自正态总体 sim N(mu ,0.0001), 容量为8的简单随机样本,得样本均值 overline (x)=2.125,-|||-则未知参数μ的置信度为0.95的双侧置信区间是 () (注:标准正态分布函数值-|||-u0.025=1.960 .05=1.64, sqrt (8)=2.825 ).-|||-选项A)(2.118,2.132)-|||-选项B) (-2.132,-2.118)-|||-选项C)(2.209,2.223)-|||-选项D) (-2.223,-2.209)