In a Naïve forecast, the forecast for the next period is simply the value of the most recent period.
Given your data:
- Week 4 has a time series value of 25.00.
Thus, the Naïve forecast for the 3rd week (i.e., the forecast for Week 5) will be:
Forecast for Week 5 = Value for Week 4 = 25.00
Therefore, rounded to 0 decimal places, the forecast for the 3rd week is:
25