To calculate the 2-period moving average forecast for the 3rd week, you take the average of the values from the two preceding weeks (Week 1 and Week 2).
Here are the values:
- Week 1: 5
- Week 2: 25
The 2-period moving average forecast for Week 3 is calculated as follows:
\[ \text{Moving Average} = \frac{\text{Value of Week 1} + \text{Value of Week 2}}{2} = \frac{5 + 25}{2} = \frac{30}{2} = 15 \]
Thus, the 2-period moving average forecast for the 3rd week is 15.