(Solution) - Table P 9 contains a time series of 80 observations Using -(2025 Original AI-Free Solution)

Paper Details

Table P-9 contains a time series of 80 observations. Using a computer program for ARIMA modeling, obtain a plot of the data, the sample autocorrelations, and the sample partial autocorrelations. Develop an appropriate ARIMA model, and generate forecasts for the next three time periods from forecast origin t = 80.