Despite the growth in digital entertainment, the nation's 400 amusement parks have managed to hold on to visitors, as the following data show:

Year................. Visitors (in millions)

2000..................................... 317

2001..................................... 319

2002..................................... 324

2003..................................... 322

2004..................................... 328

2005..................................... 335

2006..................................... 335

2007..................................... 341

a. Plot the series. Does the linear trend model or the exponential trend model fit the series best?

b. Estimate both models. Verify your answer in part a by comparing the MSE of the models.

c. Given the model of best fit, make a forecast for visitors to amusement parks in 2008 and 2009.