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Câu 61: Đường hồi quy mẫu ước lượng bời OLS có đặc điểm nào sau đây?A. Không bao giờ đi qua gốc tọa độ.B. Trùng với đường hồi quy tổng thể.C. Luôn đi qua trung bình mẫuD. Có hệ số góc lớn hơn hệ số chặn.
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