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Giả sử cho biết số lượng sản phẩm của công ty A từ tháng 1 đến tháng 8 lần lượt như sau (đơn vị tính nghìn sản phẩm):30;32;42;42;44;46;46;50Nếu chọn phương pháp hoạch định xu hướng để dự báo sản lượng thì hệ số a (intercept) của bài toán sẽ là:
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