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Câu 31. Trường hợp nào sau đây tồn tại khuyết tật phương sai sai số thay đổi?A. Tương quan giữa biến phụ thuộc và các biến độc lập cao.B. Tương quan giữa biến giải thích và phần dư cao.C. Tương quan giữa một số ( hoặc tất cả) biến giải thích cao.D. Tương quan giữa các phần dư cao.
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