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Which of the following statements are true about controlling forecasts? Forecast error may be due to problems with the model, irregular variations, and random variations. Regression models are useful in detecting inaccurate forecasts. A result that causes the tracking signal to be greater than 4 generally means that there is an issue with the forecast. When all the forecast errors plotted on a control chart are negative, it shows that the forecasting technique is performing poorly. When all the forecast errors plotted on a control chart are positive, it shows that the forecasting technique is performing adequately