1. The monthly sales for Telco Batteries, Inc., were as follows:

Month	Sales
January	24
February	25
March	19
April	17
May	16
June	20
July	21
August	22
September	24
October	24
November	25
December	27

a) Plot the monthly sales data.

b) Forecast January sales using each of the following:

i) Naive method.

ii) A three-month moving average.

iii) A six-month weighted average using 0.1, 0.1, 0.1, 0.2, 0.2, and 0.3, with the heaviest weights applied to the most recent months.

iv) Exponential smoothing using an a 5 0.3 and a September forecast of 18.

v) A trend projection.

c) With the data given, which method would allow you to forecast next March's sales?