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Câu 68: Trong các mô hình hổi quy tuyến tính, hệ số góc cho biếtA. ảnh hưởng của các biến khác không được kể đến trong mô hình tới YB. ảnh hưởng của biến Xj nào đó (có trong mô hình) tới YC. ảnh hưởng của tất cả các biến Xj có trong mô hình tới YD. ảnh hưởng của Y đến biến Xj nào đó (có trong mô hình).

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