11. The following table represents monthly sales data for a particular model of racing tires for motorcycles.

a. Calculate the single exponentially smoothed forecast, using an a of 0.20 and an initial forecast of 100.0.

b. Calculate the single exponentially smoothed forecast, using an of 0.40 and an initial forecast of 100.0.

c. Calculate the MAD for both forecasts. (Use all 12 months of data.)

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MONTH SALES MONTH SALES 123456 104 7 95 104 8 104 100 9 104 92 10 107 5 105 11 110 95 12 109