How do i add the standard deviation lines on a bar graph?
A bar graph is probably the wrong type of graph to use for this. It sounds to me like you want to add error bars to your graph of the data. Obviously, if you’re drawing this by hand, you _can_ just plot the bars up and down from the top of the bar, but if you’re using a graph drawing computer program you probably can’t do it. There are three ways I can suggest. I think the better option is to use a scatter graph and add error bars to the points, which is a fairly conventional format. The second way, if you really really want to use a bar chart for some reason, would be to use a stacked bar chart. In this case, you need to arrange your data as (lower limit), (best value – lower limit i.e. the size of the negative arm of the error bar), (upper limit – best value i.e. the size of the positive arm of the error bar). Stacking these three values will give you a single bar in three sections. The third way is a bit messy to do, but would give you a bar chart with error bars. Use a double-y gra
