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Giả sử cho biết doanh thu của công ty A trong các năm trước tương ứng với số lần quảng cáo trên báo được cho trong bảng dưới đây:Với X là biến độc lập (số lần quảng cáo trên ti vi) và Y là biến phụ thuộc (doanh số). Hàm xu hướng của trường hợp này sẽ là:
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