1. The problem statement, all variables and given/known data I have a set of data which clearly shows a linear trend. I've hand-drawn the y-axis error bars for the data (x-axis errors are negligible), and a trendline (without any mathematical/statistical techniques). The trendline stays well within each of the error bars. However, I'm also supposed to draw maximum and minimum gradients. And I've noticed that these gradients completely miss out some of the error bars. Is that usually acceptable? Or should I change some of the error values just so that the max and min gradients stay within all the error bars?