a) Generate one step ahead forecast using simple exponential smoothing(SES), using alfa= 0.80.

b) Calculate RMSE, MAE, and MAPE.

c) Please explain your approach in 5 lines.

*Please also submit your Excel worksheet with formulas, so I can see how it was done.*

Day	DJIA
9/9/16	18,085.45
9/12/16	18,325.07
9/13/16	18,066.75
9/14/16	18,034.77
9/15/16	18,212.48
9/16/16	18,123.80
9/19/16	18,120.17
9/20/16	18,129.96
9/21/16	18,293.70
9/22/16	18,392.46
9/23/16	18,261.45
9/26/16	18,094.83
9/27/16	18,228.30
9/28/16	18,339.24
9/29/16	18,143.45
9/30/16	18,308.15
10/3/16	18,253.85
10/4/16	18,168.45
10/5/16	18,281.03
10/6/16	18,268.50