Question: 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

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:

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.
b. Compute the appropriate forecasting equation.
c. Forecast the value for 2015.

Year SeriesI Series Series I1 100.0 115.2 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 100.0 115.2 130.1 144.9 160.0 175.0 189.8 204.9 219.8 235.0 249.8 264.9 31.7 150.8 74.1 200.0 230.8 266.1 305.5 351.8 403.0 469.2

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