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. 4.6 The monthly sales for Telco Batteric Inc Bows Sales Month January February March April May June July August September October November December 20 21 15 14 13 16 17 18 20 20 21 23 a) Plot the monthly sales data. b) Forecast January sales using each of the following: 1) Naive method ii) A 3-month moving average. M A 6-month weighted average using .1..1..1..2... and with the heaviest weights applied to the most recent mich iv) Exponential smoothing using an a = 3 and a Septes forecast of 18. v) A trend projection c) With the data given, which method would allow you to fora next March's sales? PX n of e ng