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The trend line for a scatter plot is a line that best captures the nature of the relationship between two variables. It may or may not be straight.
It means a pattern/ a repeated theory.
By finding a correlation trend by means of line of best fit.
Trend Graph
A scatter diagram will give a quick but rough extimate of the trend line - especially if there is a lot of variation about the trend. The least squares method will be more accurate.
Scatter graphs are best. Line graphs are OK if the trend is linear but not much good if the trend is non-linear.