How do you put a line of best fit on a graph?

[Lauren]

I plotted my data on a scatterplot graph, and I need to put a line of best
fit on my graph for my data. How do I do this??

 

[Andy Pope]

Hi,

You can add a trend line. Select the data series. Right click and add
Trendline.
Have a read of Tushar's information on the subject.
http://tushar-mehta.com/publish_train/data_analysis/16.htm

Cheers
Andy