Final answer:
The naive approach to forecasting predicts the same value for future periods as the current period's demand. Without the specific data for period 1, we cannot provide the numerical forecast.
Step-by-step explanation:
Using the naive approach to forecasting in time series analysis, we assume that the demand in the next period will be the same as the demand in the current period. To provide forecasts for periods 2 through 12, we would simply take the known value from period 1 and use this as the predicted value for all subsequent periods. Since we do not have the specific data value for period 1, the final answer cannot be provided.
However, if period 1 had, for example, 100 units, then the forecast for periods 2 through 12 using the naive method would also be 100 units for each period. The naive forecasting method is simple and does not require complicated calculations, making it a quick tool when sophisticated analysis is not critical.