Question: The observed sales for Week 1, Week 2, Week 3 and Week 4 are 25, 21, 27 and 29, respectively. The forecast for these weeks

The observed sales for Week 1, Week 2, Week 3 and Week 4 are 25, 21, 27 and 29, respectively. The forecast for these weeks were 23, 29, 21 and 28, respectively. What the mean squared error (MSE) of the forecast? (Specify your answer to 2 decimal places)

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