The monthly sales for Yazici Batteries Inc. were as follows;

a. compute the January sales forecast using naive method

b.compute the January sales forecast using 3-month moving average

c. compute the January sales forecast using 3-month weighted average with weights of 0.10 , 0.30 and 0.60 with the heaviest weights applied to the most recent months

d. compute the January sales forecast using exponential smoothing with a=0.35 and a starting forecast for september being 20

The monthly sales for Yazici Batteries, Inc Month Sales Sept Oct Nov Dec 22 20 22 22