Line of worst fit (hand drawn graph)

[Iota]

Going to throw my laptop out of the window soon. Don't think it will help though.

 

Little things are tripping me up, and I can't get answers for them anywhere I search.

 

I have a standard deviation value, I have a graph with a point plotted.

 

How to I add an error bar to this?

 

I mean, the SD value is 0.9. Do I draw the bar going 0.9 above and 0.9 below the point?

 

Or do I have the point in the middle of that error margin, and the error bar going 0.45 above and below my point on the graph?

I hope it's the latter of the two, or else I have to draw this graph for the 100th time because it's not big enough for these error bars.

Edited February 18, 2013 by Iota