(来学网)某医生随机抽取100名儿童,检测粪便蛔虫阳性率为20%,此阳性率的标准误为
  • A.
    (来学网)4%
  • B.
    (来学网)0.4%
  • C.
    (来学网)0.04%
  • D.
    (来学网)0.2%
  • E.
    (来学网)1.6%
正确答案:
A