Gnuplot Produced by GNUPLOT 5.4 patchlevel 8 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 -5 -4 -3 -2 -1 0 1 2 3 4 5 Density t score t distribution t distribution t statistic t statistic Simple/derived: Welch t test