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The table named Sales to the right, shows the sales of a supermarket (in thousand dollars) in the last 12 months. Note: to facilitate answering
The table named "Sales" to the right, shows the sales of a supermarket (in thousand dollars) in the last 12 months.
Note: to facilitate answering the questions in the next two sheets, use Excel Data Analysis Tool Pack (except for questions 1b and 2d).
Sales | |
Month | Sales |
1 | 125 |
2 | 141 |
3 | 125 |
4 | 123 |
5 | 126 |
6 | 145 |
7 | 147 |
8 | 162 |
9 | 155 |
10 | 158 |
11 | 147 |
12 | 159 |
a) Develop the 2-months and 3-months moving averages for the supermarket sales.
Note: use data analysis tool pack.
b) Which moving average appears to provide more accurate forecasts based on MAD? Explain.
Note: show your MAD calculations.
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