Please forecast the demand for each quarter of the next year using different forecasting techniques. The demand data for the past two years is shown in the table below.

	Season	time period	Demand
Year 2011	Spring	1	205
Summer	2	140
Fall	3	375
Winter	4	575
Year 2012	Spring	5	475
Summer	6	275
Fall	7	685
Winter	8	965
Year 2013	Spring	9
Summer	10
Fall	11
Winter	12

1. Using 4-period moving average, forecast the demand data for the first quarter of year 2013, i.e., time period 9.

1. Using 4-period weighted moving average, forecast the demand data for the first quarter of year 2013, i.e., time period 9 by using the weights: 4, 3, 2 and 1 (largest weight is for most recent data)

1. Using trend and seasonal indexes to forecast the demand data for each quarter of year 2013