Question: The data on page 616 (stored in ThruSpeed) represent the average time (in seconds) it took to be served at the drive-through at McDonald's from

The data on page 616 (stored in ThruSpeed) represent the average time (in seconds) it took to be served at the drive-through at McDonald's from 1998 to 2009:
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 2010?
e. Repeat (c) and (d), using W = 0.25.
f. Compare the results of (d) and (e).

Year 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Drive-Through Speed (seconds) 177.59 167.02 169.88 170,85 162.72 156.92 152.52 167.90 163.90 167.10 158.77 174.22

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