Sub: Statistics Topic: Time Series
Question:
Develop the forecasted values and calculate the MAPE.
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Using the seasonal indexes from Part 2 and the trend line, develop the forecasted values for
these data. Calculate the MAPE.
Period Sales
1 22.26
2 24.42
3 27.06
4 27.14
5 29.43
6 29.56
7 27.33
8 27.13
9 23.88
10 26.88
11 25.31
12 23.66
13 24.68
14 25.31
15 29.86
16 31.13
17 33.39
18 31.04
19 31.48
20 32.00
21 32.08
22 28.15
23 26.06
24 26.08
25 26.85
26 26.20
27 29.33
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Sub: Statistics Topic: Time Series
28 31.59
29 34.19
30 33.24
31 32.44
32 32.73
33 39.46
34 31.61
35 27.28
36 33.27
37 23.54
38 27.09
39 32.86
40 34.25
41 34.04
42 36.39
43 35.65
44 36.14
45 33.37
46 31.58
47 28.69
48 29.83
49 25.01
50 26.02