Ramalan Penjualan dari Metode Kuadratik Y I = A + BX + CX2
PT “FAHRAN” MALANG No Tahun Penjualan
(Y) Jumlah 11 170.000 0 110 108.000 1.663.000 1954
= -43,12
A = (Σ Y – C Σ X2 ) / n
= ( 170 – ((-43,12)(110))) / 11 = (170.000 – ( -4.743,2)) / 11 = 174.743,2 / 11
= 15.885,75
Y1 = 15.885,75 + 981,85X + (-43,12X2) Y2002 = 15.885,75 + 981,82(6) + (-43,12 (36)) = 15.885,75 + 5.890,92 + (-1.552,32) = 20.224,35
= 20.225