a. Calculate and display the first 50 autocorrelations for the four data series in the accompanying table, labeled A, B, C, and D; consider each of the four data series to be a quarterly time series. How many of the autocorrelations fall outside the 95 percent confidence interval (positive or negative)?
b. Is there a pattern to those autocorrelation coefficients falling outside the 95 percent confidence interval?
c. Calculate and display the first 50 partial autocorrelations for the 100 time-series observations. How many of the partial autocorrelation coefficients fall outside the 95 percent confidence interval?
d. Is there a pattern to those partial autocorrelation coefficients falling outside the 95 percent confidence interval?
e. Estimate the appropriate model as determined from your inspections carried out in parts a through d and forecast for four quarters into the future. Calculate the RMSE for each model.
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