设X~N(μ,0.09)从中随机抽取样本量为4的样本,其样本均值为,则总体均值μ的0.95的置信区间为()。
A.±0.15u0.95 B.±0.15u0.975 C.±0.3u0.95 D.±0.3u0.975正确答案B
设X~N(μ,0.09)从中随机抽取样本量为4的样本,其样本均值为,则总体均值μ的0.95的置信区间为()。
设X~N(μ,0.09)从中随机抽取样本量为4的样本,其样本均值为,则总体均值μ的0.95的置信区间为()。
A.±0.15u0.95 B.±0.15u0.975 C.±0.3u0.95 D.±0.3u0.975正确答案B