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Graph

**Solve the following problem :**

The following table shows the production of pig-iron and ferro- alloys (‘000 metric tonnes)

Year |
1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |

Production |
0 | 4 | 9 | 9 | 8 | 5 | 4 | 8 | 10 |

Fit a trend line to the above data by graphical method.

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#### Solution

Taking year on X-axis and production on Y-axis, we plot the points for production corresponding to years. Joining these points, we get the graph of time series, we fit a trend line as shown in the figure.

Concept: Measurement of Secular Trend

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