How much error is there in the forecast?

The Sure Grip Tire Company produces tires of various sizes and shapes. The demand for tires tends to follow a quarterly seasonal pattern with a trend. For a particular type of tire the company’s current estimates are as follows: a. The company has just observed the first quarter of demand D1 = 6000 and would like to update its forecast for each of the next four quarters using α = β = γ = .4. b. When demand is observed for the second quarter, it is D2 = 15,000. How much error is there in the forecast? c. Update the forecasts again for the coming year, using the second-quarter demand data.

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