120
Tabel 5.17 Tabel Peramalan Data Penjualan Dust Collector 20m³
dengan Metode Double Moving Average
t
data (xt)
M
M'
at
bt
m
Ft
et
¦et¦
pet
¦pet¦
1
33
2
38
3
35
35.33
4
46
39.67
5
34
38.33
37.78
38.89
0.56
6
39
39.67
39.22
40.11
0.44
1
39.44
-0.44
0.44
-1.14
1.14
7
55
42.67
40.22
45.11
2.44
1
40.56
14.44
14.44
26.26
26.26
8
45
46.33
42.89
49.78
3.44
1
47.56
-2.56
2.56
-5.68
5.68
9
37
45.67
44.89
46.44
0.78
1
53.22
-16.22
16.22
-43.84
43.84
10
48
43.33
45.11
41.56
-1.78
1
47.22
0.78
0.78
1.62
1.62
11
46
43.67
44.22
43.11
-0.56
1
39.78
6.22
6.22
13.53
13.53
12
52
48.67
45.22
52.11
3.44
1
42.56
9.44
9.44
18.16
18.16
13
55
51.00
47.78
54.22
3.22
1
55.56
-0.56
0.56
-1.01
1.01
14
58
55.00
51.56
58.44
3.44
1
57.44
0.56
0.56
0.96
0.96
15
63
58.67
54.89
62.44
3.78
1
61.89
1.11
1.11
1.76
1.76
16
56
59.00
57.56
60.44
1.44
1
66.22
-10.22
10.22
-18.25
18.25
17
44
54.33
57.33
51.33
-3.00
1
61.89
-17.89
17.89
-40.66
40.66
18
47
49.00
54.11
43.89
-5.11
1
48.33
-1.33
1.33
-2.84
2.84
19
56
49.00
50.78
47.22
-1.78
1
38.78
17.22
17.22
30.75
30.75
20
50
51.00
49.67
52.33
1.33
1
45.44
4.56
4.56
9.11
9.11
21
72
59.33
53.11
65.56
6.22
1
53.67
18.33
18.33
25.46
25.46
22
61
61.00
57.11
64.89
3.89
1
71.78
-10.78
10.78
-17.67
17.67
23
52
61.67
60.67
62.67
1.00
1
68.78
-16.78
16.78
-32.26
32.26
24
56
56.33
59.67
53.00
-3.33
1
63.67
-7.67
7.67
-13.69
13.69
25
68
58.67
58.89
58.44
-0.22
1
49.67
18.33
18.33
26.96
26.96
26
64
62.67
59.22
66.11
3.44
1
58.22
5.78
5.78
9.03
9.03
27
74
68.67
63.33
74.00
5.33
1
69.56
4.44
4.44
6.01
6.01
28
61
66.33
65.89
66.78
0.44
1
79.33
-18.33
18.33
-30.05
30.05
29
55
63.33
66.11
60.56
-2.78
1
67.22
-12.22
12.22
-22.22
22.22
30
57
57.67
62.44
52.89
-4.78
1
57.78
-0.78
0.78
-1.36
1.36
31
77
63.00
61.33
64.67
1.67
1
48.11
28.89
28.89
37.52
37.52
32
80
71.33
64.00
78.67
7.33
1
66.33
13.67
13.67
17.08
17.08
33
66
74.33
69.56
79.11
4.78
1
86.00
-20.00
20.00
-30.30
30.30
34
1
83.89
35
2
88.67
36
3
93.44
TOTAL
8.00
279.56
-36.77
485.21
MAPE = 17.33
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