Quarterly demand for smartphones at a retailer is as shown. Year Quarter Demand 1 1 513 11 932 III 1,509 IV 1,902 N 1 693 11 1,163 III 1,857 IV 2,469 31 846 II 1,439 III 2,271 IV 3,079 1 1,070 1,751 III 2,785 IV 3,613 Forecast quarterly demand for year 5 using the following models: 1. 4-week simple moving average 2. Simple exponential smoothing with a=0.1 3. Trend adjusted exponential smoothing (Holt's model) with a=0.1 and B=0.1 4. Linear regression with seasonality