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Câu 5. Trong mô hình hồi quy tuyến tính đơn, nhân cả biến phụ thuộc và biến giải thích với 100 cho kết quả:A. ước lượng OLS của hệ số góc không đổi.B. Hệ số tương quan mẫu giữa X và Y không đổi.C. Hệ số xác định bội của hàm hồi quy mẫu không đổi.D. Cả A, B và C.

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