A firm has the following sales history over the last 4 years (million ).	Year	Quarter	Sales	Year	Quarter	Sales
	2014	1st	23	2016	1st	24
	2nd	2nd	13	12	2nd	12
	3rd	3rd	20	22	3rd	22
	4th	4th	10	10	4th	10
	2015	1st	25	2017	1st	26
	2nd	2nd	12	14	2nd	14
	3rd	3rd	21	19	3rd	19
	4th	4th	11	12	4th	12

Assume 2017 to be the beyond sample period.

9. Compute the forecast of the demand for 2017 applying the seasonal simple mean methodology.

10. Compute the forecast of the demand for 2017 applying the seasonal nave methodology.

According to the results in the previous questions,

11. Which method would you choose?

12. How accurate is that method?

13. Compute the tracking signal for it (do it for each beyond sample period).