It is the line of best fit.
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The scatter diagram is used when the data is in a "Raw state" or what is referred to as "Raw Data". Example 10, 20,10,50,90,80,56,70,70,
A line of best fit or a trend line.
It is to find the line of best fit for the co-relation of data
The answer to ts question is....Trend Line.
Because it's a more accurate representation of the data collected.