(a) Plot the voter participation rate. (b) Describe the
trend (if any) and discuss possible causes. (c) Fit both a linear and a
quadratic trend to the data. (d) Which model is preferred? Why? (e) Make a
forecast for 2008, using a trend model of your choice (or a judgment forecast).
(f) Check the Web for the actual 2008 voter participation rate. How close was
your forecast? Note: Time is in 4-year increments, so use t = 15 for the 2008
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