
1. Give one example of time series having decreasing trend.
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2. What is a time series?
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3. Which of the components of time series produce shortterm variation ?
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4. What is meant by analysis of time series?
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5. What is the notation to show the cyclical component of the time series ?
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6. State the names of methods of measuring trend.
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7. The effect of which component indicates fluctuations repeating within one year?
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8. State the components of time series.
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9. When is the method of moving average more useful to find trend?
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10. The linear equation fitted using the data of 7 weeks for a variable y is = 25.1  1.3t. Estimate the value of y for the eight week.
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11. What is forecasting?
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12. State the independent variable and dependent variable of time series.
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13. State the important elements of a time series?
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14. In which two stages is the analysis of time series done?
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15. For whom is the analysis of time series useful?
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16. What are longterm fluctuations?
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17. State the example of increasing terms of time series.
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18. Which is the important component in any time series?
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19. What is linear trend?
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20. What is meant by 'duration of oscillation'?
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21. Which component of the time series is important in taking decisions related to economic policy?
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22. What is meant by seasonal fluctuations?
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23. What is the duration of oscillation for seasonal fluctuations?
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24. Give two examples of seasonal fluctuations.
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25. What is meant by cyclical fluctuations?
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26. Give two examples of cyclical fluctuations.
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27. What is the duration of oscillation for cyclical fluctuations?
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28. How will you obtain cyclical fluctuations?
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29. By which other name the seasonal and cyclical fluctuations known?
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30. What are random variations?
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31. In the study of time series what are random and irregular fluctuations?
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32. State the factors responsible for random or irregular fluctuation.
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33. Which type of fluctuations in time series cannot be controlled nor predicted in advance?
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34. Due to which component of time series can an error occur in estimated value?
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35. What is the estimation method of trend?
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36. Why is the time series model 'I' called an additive model?
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37. Write the additive model of the time series.
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38. How will you draw the graph of a time series?
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39. State the linear trend model of the time series.
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40. State the main limitation of the graphical method of the time series.
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41. By which condition the values of constant α and β can be obtain?
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42. What error is shown by variable Uₜ of time series?
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43. State the fitted equation of linear trend of the time series.
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44. What is called the formula of forecasting linear trend of the time series?
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45. How will you find the values of 'a' and 'b' in the fitted equation of linear trend?
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46. When is the method of least squares not useful in the trend line?
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47. In which method the future estimates do not change subjectively with the person?
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48. Which component is 'Population density during the year 1901 to 2011' ?
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49. By which method is the effect of shortterm component eliminated to a large extent?
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If the equation y = 45.8  1.8 t is for the value of variable from January to September, then find the estimated value for December.
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Chapter 4 Practice Material
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Statistics Important Theory
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