利用该样本信息估计总体均数95%置信区间,公式是

A、3.50±1.96×0.50
B、[img=~/QImg/2013-10-14-11-38-02/image032.gif]
C、3.50±1.96×0.50/16
D、[img=~/QImg/2013-10-14-11-38-02/image033.gif]
E、3.50±t[img=~/QImg/2013-10-14-11-38-02/image034.gif]×0.50/16