Dùng thuốc A để điều trị bệnh lao cho 52 người, thấy có 21 người khỏi. Dùng thuốc B điều trị bệnh lao cho 20 người thì có 12 người khỏi. Với mức ý nghĩa α (alpha)= 0,02 thì có thể cho rằng hiệu quả điều trị cảu thuốc B cao hơn hay không ? (Cho biết : Ø (2,06) = 0,98) .

bị xóa vì bị trùng bởi Đức Vỹ 24-10-13 04:28 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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