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Câu 27. Sai số ngẫu nhiên Ui không dùng để thay thế choA. các biến ảnh hưởng đến biến phụ thuộc Y.B. các biến ảnh hưởng đến biến phụ thuộc Y nhưng không có số liệu.C. các biến có ảnh hưởng rất nhỏ, không đáng kể đến biến phụ thuộc Y.D. các biến ảnh hưởng đến biến phụ thuộc Y mà chúng ta không biết hoặc biết không rõ.
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