What is the best way to represent a paired T test comparison for a sample with N=200 and 5 variables (only one of which is important)? nonpaired T test is not significant.
A before-after graph is too dense (too many arrows).
A normal boxplot of the differences doesn't show any significance (maybe do I have to plot it with the mean confidence intervals?).
A boxplot of both variables (before and after) doesn't show the small but significant (5% differences) effect. Same happens with kernel density graphs.