The following data, stored in Spills provide the number of oil spills in the Gulf of Mexico from 1996 to 2011:

a. Plot the time series.
b. Fit a three-year moving average to the data and plot the results.
c. Using a smoothing coefficient of W = 0.50, exponentially smooth the series and plot the results.
d. What is your exponentially smoothed forecast for 2012?
e. Repeat (c) and (d), using W = 0.25.
f. Compare the results of (d) and (e).

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Year 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 Number of Spills