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Câu 21. Trong mô hình hồi quy tuyến tính đơn, nhân biến phụ thuộc với 100 và giữ nguyên biến giải thích cho kết quảA. ước lượng OLS của hệ số góc không đổi.B. ước lượng OLS của hệ số chặn không đổi.C. R2 không đổiD. tất cả

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