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Câu 25. Trong mô hình hồi quy bội, điều nào sau đây không đúng về ma trận hiệp phương sai?A. Phải là ma trận đối xứng.B. Phải là ma trận vuông.C. Các phần tử nằm trên đường chéo chính có thể âm, dương hoặc bằng 0.D. Các phần tử không nằm trên đường chéo chính có thể âm, dương hoặc bằng 0.
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