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Câu 91: Trong mô hình hồi quy bội, R^2=0 có nghĩa là:A. Hàm hồi quy không phù hợpB. Các biến giải thích sử dụng trong mô hình là không phù hợpC. Tất cả các hệ số góc đồng thời bằng 0D. Cả A, B và C
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