Problem 1: The quarterly cost (in million) of Temitope Industries Nigeria PLC are as follow
|
Years/Quarters
|
1
|
2
|
3
|
4
|
|
1994
|
14.01
|
14
|
13.91
|
14.93
|
|
1995
|
14
|
14.36
|
14.42
|
15.942
|
|
1996
|
14.65
|
15
|
14.98
|
15.942
|
|
1997
|
15.06
|
|
|
15.75
|
Determine the seasonal component of the time series by ratio - to moving average method
Problem 2: The following figures show the production in millions of tons in a certain industry over a ten year period
Year Production
1988 98
1989 92
1990 80
1991 89
1992 83
1993 69
1994 69
1995 67
1996 58
1997 61
a. Use the regression analysis method to estimate the trend component of the time series.
b. Use the equation to forecast production in 1998 and 1999.
Problem 3: The following data shows the quarterly sales in million for WAZOBIA ventures Nigeria Plc.
|
Years/Quarters
|
I
|
II
|
III
|
IV
|
|
1994
|
73
|
71
|
88
|
104
|
|
1995
|
114
|
103
|
105
|
142
|
|
1996
|
153
|
152
|
158
|
165
|
|
1997
|
181
|
170
|
174
|
187
|
Calculate the seasonal index using the link relative method. De-seasonalise the original data.
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