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