The monthly sales for yazici batteries inc were as follows


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

MONTH

SALES

January

20

February

21

March

15

April

14

May

13

June

16

July

17

August

18

September

20

October

20

November

21

December

23

a) Plot the monthly sales data.

b) Forecast January sales using each of the following:

i) Naive method.

ii) A 3-month moving average.

iii) A 6-month weighted average using .1, .1, .1, .2, .2, and .3, with the heaviest weights applied to the most recent months.

iv) Exponential smoothing using an a = .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?

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