National Scan, Inc., sells radio frequency inventory tags. Monthly sales for a seven-month period were as follows: Month Sales (000)Units
Feb. 20
Mar. 20
Apr. 7
May. 22
Jun. 18
Jul. 24
Aug. 30

a. Plot the monthly data on a sheet of graph paper.
b. Forecast September sales volume using each of the following:

1. The naive approach.
2. A five month moving average.
3. A weighted average using .60 for August, .30 for July, and .10 for June.
4. Exponential smoothing with a smoothing constant equal to .20, assuming a a March forecast of 19(000).
5. A linear trend equation.