Consider the accompanying time series forecast the demand


Consider the accompanying time series.

a. Forecast the demand for each quarter in Year 4 using multiplicative decomposition.

b. Interpret the meaning of the seasonal components.

c. Calculate the MAD for this forecast.

Year 1

Year 2

Year 3

Quarter

Demand

Quarter

Demand

Quarter

Demand

1

28

1

28

1

27

2

20

2

15

2

15

3

24

3

20

3

19

4

10

4

10

4

6

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Basic Statistics: Consider the accompanying time series forecast the demand
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