Last week's sales of iMac computers at an Apple Store in Oklahoma City, OK,are shown in the following table:
|
Day
|
Sales (Dollars)
|
|
1
|
180
|
|
2
|
150
|
|
3
|
210
|
|
4
|
225
|
|
5
|
195
|
|
6
|
190
|
|
7
|
230
|
(a) Use the 3-day moving average method for forecasting days 4-7.
(b) Use the 3-day weighted moving average method for forecasting days 4-7. Use Weight 1 day ago = 2, Weight 2 days ago = 4, and Weight 3 days ago = 3.
(c) Compare the techniques using the mean absolute deviation (MAD).