In addition to his day job as an engineer, Luis Garcia runs a small ethnic grocery store.

Question:

In addition to his day job as an engineer, Luis Garcia runs a small ethnic grocery store. The shop food items from southeast Asian countries and caters to the large population of people from this region who live in Luis€™s community. Luis wants to develop a quantitative model to forecast sales. His sales data (in thousands) for the past 16 quarters are as shown in the Table for Problem 11-40.

Develop a multiplicative decomposition model for Luis€™s sales data. Use the model to forecast revenues for year 4. Comment on the validity of the model.

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