Tugas SKB 4

  Tugas SKB

  

Metode Kuadratik (Genap)

Oleh:

  Rizki A 02610393

JURUSAN MANAJEMEN

FAKULTAS EKONOMI

UNIVERSITAS MUHAMMADIYAH MALANG No Tahun Penjualan (Y) Prediksi (X) X^2

  XY X^2Y X^4 Y’ 1 1994 15.900 17.219,51 2 1995 16.900

  1 1 16.900 16.900 1 20.499,08 3 1996 17.300 2 4 34.600 69.200 16 23.912,53 4 1997 18.000 3 9 54.000 162.000 81 27.459,86 5 1998 19.250 4 16 77.000 308.000 256 311.410,07 6 1999 19.900 5 25 99.500 497.000 625 34.456,16 7 2000 20.000 6 36 120.000 720.000 1.296 38.901,35 8 2001 20.800 7 49 145.000 1.019.200 2.401 42.987,98 9 2002 21.250 8 64 170.000 1.360.000 4.096 47.204,71 10 2003 22.000 9 81 198.000 1.782.000 6.561 51.555,32

  Jumlah 191.300

  45 285 915.600 5.934.800 15.333

  4 ^{2 2}

  

  Y

  X X Y

  X       

   

₂ a = _{4 2}

  

  n 

X  

X 

 

    ( 191 . 300 )( 15 . 333 ) ( 5 . 934 800 )( 285 )

  = ²

   10 ( 15 . 334 ) ( 285 ) 2 . 933 . 202 . 900 

  1 . 691 . 418 . 000

  =

  153 . 340  81 . 225 1 . 241 . 784 . 900

  =

  72 . 115

  = 17.219.51

  XY  ₂ b =

  X 

  915 . 600

  =

  285

  = 3.212,63 _{2 2}  n (

  X Y ) ( X )( Y )    c = _{2 2 2}

   n ( X ) ( X )

   

    10 ( 5 . 434 800 ) ( 285 )( 191 . 300 )

  = ²

   10 ( 15 . 333 ) ( 285 ) 59 . 348 . 000 

  54 . 520 . 500

  =

  153 . 340  81 . 225 4 . 827 . 500

  =

  72 . 115

  =66,94

  2 Y’ = a + bX + cX