1. Moving averages are used to show seasonality in a time series. 2. Moving aver

Question

1. Moving averages are used to show seasonality in a time series. 2. Moving averages may be used to track daily, weekly, or monthly patterns. 3. The exponentially smoothed values of the time series given by 39, 37, 61, 58,18 with 0.7 is given by 39, 37.6, 54.0, 56.8, 29.6. 4. Consider a time series of length six (i.e. 1, 2, 6) given by the values g average for the time series is given by 150, 270, 200, 140, 250, 110. A four-period movin the values 195.0, 202.5 and 175.0 An exponentially smoothed time series is given by a model of the form St+1 Dy+() S-1. 5. QUESTION 21 Which statement is correct? 1. The cyclical component occurs on short time series and as a result these components are the most commonly occurring patterns in time series. 2. The irregular component is that left over when the other components of the series (trend, seasonal and cyclical) have been accounted for 3. Seasonality is the underlying direction (an upward or downward tendency) and rate of change in a time series, when allowance has been made for the other components. 4. Trend is a short-term movement in a time series. 5. Forecasting is not one of the aims of time series analysis. QUESTION 22 Trend refers to 1. a sequence of observations which are ordered in time (or space) a long-term movement in a time series providing the underlying direction (an upward or downward tendency) and rate of change in a time series, when allowance has been made for the other components 3. a nonseasonal component which varies in a recognisable cycle. 4. estimating the value of a variable at times which have not yet been observed 5. a long time series. 57

Explanation / Answer

Question 21) The irregular component is that left over when the other components of the series (trend , seasonality and cyclical) have been accounted for

Question 22) Option 2

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