采用正态近似法估计总体率的95%置信区间,其公式为

  • A: (p-1.96S/√n,p+1.96S/√n)
  • B: (p-2.58S/√n,p+2.58S/√n)
  • C: (p-1.96Sp,p+1.96Sp
  • D: (p-2.58Sp,p+2.58Sp
  • E: (p-1.96S,p+1.96S)

答案:

解析: