The following data represent revenues in thousands of dollars for a manufacturer of small electric appliances.
Year Quarter Revenues
1996 1 514
1996 2 822
1996 3 648
1996 4 976
1997 1 616
1997 2 884
1997 3 678
1997 4 996
1998 1 658
1998 2 850
1998 3 714
1998 4 1052
a) Calculate the moving averages for this time series.
b) Find the seasonal index for each quarter.
c) From the fourth quarter of 1997 to the first quarter of 1998, revenues declined. What happened on a seasonally adjusted basis?
d) Compute the forecast for the second quarter of 2002.
e) Find the regression equation to predict the long term trend in the seasonally adjusted revenues.