The following information has been collected on the sales of gift cards for the past 6 weeks.
?Week? Sales
?1? 105
?2? 90
?3? 95
?4? 110
?5? 105
?6? 100
a. Produce exponential smoothing forecasts for the series using a smoothing constant of 0.2 given that the forecast of week 3 is 98.
b. Produce all possible three-period moving average forecasts.
c. Find the forecast for week 5 given that weights of 0.33, 0.17, and 0.5 are used.