Please show all steps and answer all parts.

3. The monthly sales for Telco Batteries, Inc., were as follows in Table 1: Table 1: Monthly Sales MONTH SALES January 10 February 14 March 15 April 14 May 12 June 10 July 14 August 18 September 20 October 20 November 22 December 23 Forecast January sales using each of the following: a) A 4-month moving average. b) Exponential smoothing using an alpha = 0.25 Which of the forecast models is better and why? ) Using the tracking signal with a control limit of + to show if the exponential smoothing model of b) is in control. Discuss your result