Essay
Quarterly sales figures for e-commerce retail sales were obtained from the first quarter of 2009 through the fourth quarter of 2015. A regression model was estimated to describe the trend in e-commerce retail sales over time.
a. Based on the plot of residuals versus predicted values, is the linear model appropriate? Explain. 
b. The Durbin-Watson statistic for this regression model was found to be 1.727. What can you conclude from this statistic at the 0.01 level of significance?
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a. The residual plot shows a curvature. ...View Answer
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