you are not allow use any computer software for any calculations, only allow handwriting calculations and you need to write it step by step clearly.

Question 4 BestView, a manufacturer of LED television, wants to forecast the demand of its best-selling model, "Curved TV". The actual demand for the first five months of the year are given as follows: Month Demand (At) Jan 362 Feb 381 Mar 3 317 Apr 4 297 May 399 a) By using simple moving average with n = 4, forecast the demand for lune. b) By using exponential smoothing with a = 0.2 and F; = 360.6667, forecast the demand for lune. C) By using simple linear regression with Demand (as Y against t (as X), forecast the demand for June D) For the first five months, find the tracking signal of exponential smoothing with = 0.2 and F1 = 360.6667 and that of simple linear regression