Một công ty kinh doanh tổng hợp thống kê doanh số bán hàng của các tháng trong năm qua trong bảng sau
Tháng Doanh thu (tỉ đồng) Tháng Doanh thu (tỉ đồng)
1 12.23 7 12.02
2 13.32 8 13.61
3 10.16 9 11.17
4 11.94 10 12.89
5 10.65 11 10.70
6 13.48 12 13.53
Yêu cầu:
a. Dự báo doanh thu bán hàng tháng 1 năm tiếp theo bằng phương pháp bình quân di động 4 tháng và 4 tháng có trọng số (1,2,3,4), phương pháp san bằng số mũ với hệ số san bằng là 0.3
b. Tính MAD của mỗi phương pháp.
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