Question

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.

Answer 1

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.