Using the 911 call data in Problem 4.31, forecast calls for weeks 1 through 7 with a trend-adjusted exponential smoothing model. Assume an initial forecast for 50 calls for week 1 and an initial trend of zero. Use smoothing constants of α= .30 and β= .20. Is this model better than that of Problem 4.31? What adjustment might be useful for further improvement? (Again, assume that actual calls in week 7 were 33.)

Data from problem 4.31

Emergency calls to the 911 system of Durham, North Carolina, for the past 6 weeks are shown in the following table:

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WEEK CALLS 1 50 2 35 3 25 4 40 5 45 6 35