tramntb63khhh tramntb63khhh
  • 26-10-2022
  • Mathematics
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Để xác định tỷ lệ người mắc chứng bướu cổ do thiếu hụt iode ở một khu vực dân cư
nào đó, cần khám bao nhiêu người nếu muốn cho khoảng ước lượng có độ chính xác không vượt quá 0.04 với mức tin cậy 0.95

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