Question: The following table gives the historical data on the number of passengers traveling by Super City Bus service. Decompose the time series data into trend and seasonal factors and make forecasts for each quarter in 2007.
Number of Passengers (000)
Quarter 2004 2005 2006
I 1,200 1,500 1,700
II 600 700 800
III 1,000 1,000 1,300
IV 600 800 800