某溶液中的乙醇浓度服从正态分布,从中抽取一个样本量为4的样本,求得=8.5,样本标准差为s=0.04,则正态均值μ与σ的95%的置信区间分别为()
A.[8.292,8.550] ; [0.017,0.112] B.[8.430,8.550];[0.023,0. 112] C.[8.436,8.564] ; [0.023,0. 149] D.[8.449,8.564];[0.017,0. 149]正确答案C
某溶液中的乙醇浓度服从正态分布,从中抽取一个样本量为4的样本,求得=8.5,样本标准差为s=0.04,则正态均值μ与σ的95%的置信区间分别为()
A.[8.292,8.550] ; [0.017,0.112] B.[8.430,8.550];[0.023,0. 112] C.[8.436,8.564] ; [0.023,0. 149] D.[8.449,8.564];[0.017,0. 149]正确答案C