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Marvin Greene is interested in modeling the sales of the retail industry. He collected data on aggregate sales and found the following:
Salest = 0.345 + 1.0 Salest-1The standard error of the slope coefficient is 0.15, and the number of observations is 60. Given a level of significance of 5%, which of the following can we NOT conclude about this model? A. The model has a unit root. B. The model is covariance stationary. C. The slope on lagged sales is not significantly different from one. |