Question:
The table below gives the quarterly enrollment in a major American business college for the period 2007-2010.
|
Year
|
Winter
|
Spring
|
Summer
|
Autumn
|
|
2007
|
2033
|
1871
|
714
|
2318
|
|
2008
|
2174
|
2069
|
840
|
2413
|
|
2009
|
2370
|
2254
|
927
|
2704
|
|
2010
|
2625
|
2478
|
1136
|
30
|
a) Draw to scale a time series graph representing the above data.
b) Using the ratio-to-moving-average method, determine the quarterly seasonal indices.
c) Interpret the quarterly pattern of enrolment
d) Compute the trend equation.
e) Forecast the 2011 enrolment by quarter.