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

MONTHSALES

JANUARY20

FEBRUARY21

MARCH15

APRIL14

MAY13

JUNE16

JULY17

AUGUST18

SEPTEMBER20

OCTOBER20

NOVEMBER21

DECEMBER23

1)Plot the monthly sales data

2)Forecast January sales using each of the following;

1. nave method

2. A 3-month moving average

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

4. Exponential smoothing using an a = .3 and a September forecast of 18.

5. A trend projection.