Hello, I have the following information:

Quarterly demand for smartphones at a retailer is as shown.

Quarterly demand for smartphones at a retailer is as shown.

Year	Quarter	Demand
1	I	513
	II	932
	III	1,509
	IV	1,902
2	I	693
	II	1,163
	III	1,857
	IV	2,469
3	I	846
	II	1,439
	III	2,271
	IV	3,079
4	I	1,070
	II	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=0.1
3. Trend adjusted exponential smoothing (Holt's model) with=0.1and=0.1
4. Linear regression with seasonality

Note: I started and made my chart in excel but there is something wrong and I think that my moving average is not right because I don't know how to move forward with year 5. I would appreciate it if you could help me. Thank you.

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