TREND & SEASONAL VARIATION PURE COMPETITION VERSUS PURE MONOPOLY

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TIME SERIES ANALYSIS – TREND & SEASONAL VARIATION
Sales from months 1 to 6 were 105, 140, 190, 135, 170 and 220 respectively. Assuming a three-period seasonal variation, identify the trend, the seasonal variations and then predict sales for months 7, 8 and 9
Month(s)
Sales
Trend (Three-period moving average)
Seasonal variations
1
105
 
 
2
140
 
 
3
190
 
 
4
135
 
 
5
170
 
 
6
220
 
 
7
 
 
 
8
 
 
 
9
 
 
 
REGRESSION ANALYSIS

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