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Câu 26. Trong kiểm định giả thuyết đồng thời nhiều hệ số hồi quy, nếu giả thuyết H0 bị bác bỏ thìA. Các kiểm định hệ số riêng lẻ tương ứng có thể cho hoặc không cho cùng một kết quả.B. tất cả các hệ số góc đều thực sự khác 0.C. tất cả các hệ số đều thực sự khác 0.D. thống kê F có thể âm.

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