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BAYU FIRMAN SAPUTRA 04610262

METODE LEAST SQUARE DATA GANJIL PT. MUNDUR MAJU

NO TAHUN

PENJUALAN

(Y) PREDIKSI (X) X^2 XY

1 1988 5500 -5 25 -27500

2 1989 6000 -4 16 -24000

3 1990 6500 -3 9 -19500

4 1991 7000 -2 4 -14000

5 1992 7500 -1 1 -7500

6 1993 8000 0 0 0

7 1994 8500 1 1 8500

8 1995 9000 2 4 18000

9 1996 9500 3 9 28500

10 1997 10000 4 16 40000

11 1998 10500 5 25 52500

JUMLAH 11 88000 0 110 55000

88000

A= = 8000

11

55000

B = = 500

110

Maka persamaan least squarenya adalah: Y’ = A+BX

Y’ =8000 + 500X

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Maka ramalan penjualan untuk tahun 1999 : Y99 = 8000 + 500(6)

Y99 = 8000 + 3000

Y99 = 11000 unit.

Maka ramalan untuk tahun 2001 : Y2001 = 8000 + 500 (8)

Y2001 = 8000 + 4000

Y2001 = 12000 unit

Ramalan penjualan tahun sebelumnya misalkan tahun 1987 adalah: Y1987 = 8000 + 500 (-6)

Y1987 = 8000 + (-3000)

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