A company produces a certain product and records its monthly sales for the past 18 months, as

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Question:

A company produces a certain product and records its monthly sales for the past 18 months, as shown below:

Month Sales
1 25
2 28
3 26
4 30
5 29
6 31
7 33
8 36
9 35
10 39
11 42
12 41
13 45
14 47
15 49
16 51
17 54
18 53

Using the exponential smoothing method with alpha = 0.3, forecast the sales for the next 3 months. Assume that the initial forecast for month 1 is equal to the actual sales for month 1, which is 25.