Bulan
|
Y
|
X
|
X²
|
X.Y
|
X²Y
|
X⁴
|
Januari 2016
|
300
|
-9
|
81
|
-2.700
|
24.300
|
6.561
|
Februari 2016
|
350
|
-7
|
49
|
-2.450
|
17.150
|
2.401
|
Maret 2016
|
400
|
-5
|
25
|
-2.000
|
10.000
|
625
|
April 2016
|
500
|
-3
|
9
|
-1.500
|
4.500
|
81
|
Mei 2016
|
700
|
-1
|
1
|
-700
|
700
|
1
|
Juni 2016
|
750
|
1
|
1
|
750
|
750
|
1
|
Juli 2016
|
800
|
3
|
9
|
2.400
|
7.200
|
81
|
Agustus 2016
|
800
|
5
|
25
|
4.000
|
4.000
|
625
|
September 2016
|
850
|
7
|
49
|
5.950
|
41.650
|
2.401
|
Oktober 2016
|
900
|
9
|
81
|
8.100
|
72.900
|
6.561
|
Σ
|
6.350
|
0
|
330
|
12.450
|
183.150
|
19.398
|
Metode Eliminasi ΣY = n . a + c . Σ X²
6350 = 10a + c 330
ΣX²Y = Σ X² a + c . Σ X⁴
183.150 = 330a + c19398
6350 = 10a + c 330
ΣX²Y = Σ X² a + c . Σ X⁴
183.150 = 330a + c19398
6.350 = 10a + c330 183.150 = 330a + c19.338 (x58,6)
188.960 = 256a
a = 188.960 = 738,125
256
256
b = ΣXY = 1.2450 = 37,72
ΣX² 330
ΣX² 330
c = 6.350 = 10a + c330183.150 = 330a + c19.338 (x33)
209.550 = 330a + c10.890
183.150 = 330a + c19.338 -
26.400 = -8.448c
c = 26.400 = -3,125
- 8.448
Y = a + bx +(x)²
November 2016 = 738,12 + 37,72 . 11 + (-3,12) 11²
= 775,52 / 776 botol
= 775,52 / 776 botol
Desember 2016 = 738,12 + 37,72 . 13 + (-3,12) 12²
= 701,2 / 701 botol
= 701,2 / 701 botol
Januari 2017 = 738,12 + 37,72 . 15 + (-3,12) 15²
= 601,92 / 602 botol
= 601,92 / 602 botol
Februari 2017 = 738,12 + 37,72 . 17 + (-3,12) 17²
= 477,68 / 478 botol
= 477,68 / 478 botol
Maret 2017 = 738,12 + 37,72 . 19 + (-3,12) 19²
= 328,48 / 328 botol
= 328,48 / 328 botol
April 2017 = 738,12 + 37,72 . 21 + (-3,12) 21²
= 154,32 / 154 botol
= 154,32 / 154 botol
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