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Câu 19. Trong mô hình hồi quy tuyến tính đơn, ước lượng hệ số chặn bằng 0 cho biếtA. đường hồi quy mẫu sẽ đi qua gốc tọa độ.B. đường hồi quy mẫu sẽ song song với trục hoành.C. đường hồi quy tổng thể sẽ song song với trục tung.D. đường hồi quy tổng thể cắt trục tung và trục hoành tại 2 điểm phân biệt.

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