Time Series Analysis and Forecasting Time Series Analysis and Forecasting Question Time Series Analysis and Forecasting”: Exercises 20.47, 20.48, 20.49, 20.50, and 20.51 Gradign Criteria Plotted the time series accurately. Discussed why exponential smoothing is not recommended as a forecasting tool in situation. Used regression analysis to determine the trend line. Determined the seasonal indexes accurately. Accurately forecasted revenues for the next four quarters.