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A time-series plot often helps you determine the appropriate model to use For this problem use each of the time series presented in the following table and stored in

A time-series plot often helps you determine the appropriate model to use. For this problem, use each of the time series presented in the following table and stored in TsModel2 . Year 2000 2001 2002 2003 2004 Time series I 100.0 115.2 130.1 144.9 160.0 Time series II 100.0 115.2 131.7 150.8 174.1 Year 2005 2006 2007 2008 2009 Time series I 175.0 189.8 204.9 219.8 235.0 Time series II 200.0 230.8 266.1 305.5 351.8 a. Plot the observed data (Y) over time (X) and plot the logarithm of the observed data (log Y) over time (X) to determine whether a linear trend model or an exponential trend model is more appropriate. (Hint: If the plot of log Y vs. X appears to be linear, an exponential trend model provides an appropriate fit.) b. Compute the appropriate forecasting equation. c. Forecast the value for 201

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