Question: Consider the following demand data for a certain product over four quarters in 2 0 1 9 and four quarter in 2 0 2 0

Consider the following demand data for a certain product over four quarters in 2019 and four quarter in 2020.(The data can be directly copied into Excel.)
Period Quarter Demand
12019 Q1830
22019 Q21050
32019 Q3930
42019 Q4770
52020 Q1740
62020 Q2930
72020 Q3810
82020 Q4680
We have noticed a seasonal pattern in the data and thus decided to use a cycle decomposition technique with multiplicative seasonality to forecast the trend into 2021, i.e., periods 9 through 12.

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