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प्रश्न
Write a brief note on seasonal variations
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उत्तर
Seasonal Variations: As the name suggests, tendency movements are due to nature which repeat themselves periodically in every seasons.
These variations repeat themselves in less than one year time.
It is measured in an interval of time.
Seasonal variations may be influenced by natural force, social customs and traditions.
These variations are the results of such factors which uniformly and regularly rise and fall in the magnitude.
For example, selling of umbrellas’ and raincoat in the rainy season, sales of cool drinks in summer season, crackers in deepawali season, purchase of dresses in a festival season, sugarcane in Pongal season.
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संबंधित प्रश्न
Define Time series
Mention the components of the time series
Define seasonal index
The annual production of a commodity is given as follows:
| Year | production (in tones) |
| 1995 | 155 |
| 1996 | 162 |
| 1997 | 171 |
| 19988 | 182 |
| 1999 | 158 |
| 2000 | 880 |
| 2001 | 178 |
Fit a straight line trend by the method of least squares
The sales of a commodity in tones varied from January 2010 to December 2010 as follows:
| In Year 2010 | Sales (in tones) |
| Jan | 280 |
| Feb | 240 |
| Mar | 270 |
| Apr | 300 |
| May | 280 |
| Jun | 290 |
| Jul | 210 |
| Aug | 200 |
| Sep | 230 |
| Oct | 200 |
| Nov | 230 |
| Dec | 210 |
Fit a trend line by the method of semi-average
Choose the correct alternative:
A time series is a set of data recorded
Choose the correct alternative:
Factors responsible for seasonal variations are
Choose the correct alternative:
The value of ‘b’ in the trend line y = a + bx is
Sum of the first n terms of the series `1/2 + 3/4 + 7/8 + 15/16 +`......... is equal to:
The sum of the series 3.6 + 4.7 + 5.8 + ....... upto (n – 2) terms
