Final answer:
To forecast the 5th period using 4-MA, data points for periods 1 to 4 are needed. Without this data, it's not possible to provide the correct forecast.
Step-by-step explanation:
The student is asking for a forecast for the 5th period using a 4-period moving average (4-MA). A moving average is a statistical technique to analyze data points by creating a series of averages of different subsets of the full data set. For a 4-period MA, we take the average of the data over 4 periods to smooth out fluctuations and help to identify trends.
To calculate the 4-MA for the 5th period, we would need the data values for periods 1 through 4. However, the student has not provided this data, so we are unable to compute the forecast.
If we had the data points for periods 1 through 4, the process to forecast the 5th period would be to add those four data points together and divide by 4. Without this data, we can't give a correct forecast.