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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).

    • 12 years ago
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