Gnuplot Produced by GNUPLOT 5.2 patchlevel 4 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 -60 -50 -40 -30 -20 -10 0 10 Density t score sbocchino: Welch t test t distribution t distribution t statistic t statistic