why do paired t test have error bars which statement best describes the error bars in a paired study? how to use error bars on paired test which of the following would you add an error bar on a plot? why do we need bar graph error what is the error bar in the plot of a cross-over study why use error bars in plot when to use error bar for crossover why does a plot need to have error bars what does error bars represent in paired test t test for glucose why are standard errors in graphs needed how to plot error bars why use error bars in paired studies? which of the following would be the appropriate use of paired error bars? why are error bars used in cross study why do the plots have error bars what is the standard error for combining data in a plot what is the error plot for a cross-over study how many error bars in a cross over plot