Question: Ninja-Ninja, Inc., wants to forecast its quarterly sales. Ninja-Ninja believes that its sales in a quarter are a function of its total advertising expenditures in

Ninja-Ninja, Inc., wants to forecast its quarterly sales. Ninja-Ninja believes that its sales in a quarter are a function of its total advertising expenditures in the preceding two quarters combined.

(a) Use the follow- ing data for the past eight quarters to construct a forecasting model that expresses quarterly sales as a linear function of advertising expenditures in the previous two quarters combined.

(b) Use the model in part

(a) to forecast sales in quarter 1 of year 3.

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