nag_univar_ttest_2normal (g07cac) Example Program Results Assuming population variances are equal. t test statistic = 1.8403 Degrees of freedom = 10.0 Significance level = 0.0955 Lower confidence limit for difference in means = -0.8429 Upper confidence limit for difference in means = 8.8429 No assumptions about population variances. t test statistic = 2.5922 Degrees of freedom = 7.9925 Significance level = 0.0320 Lower confidence limit for difference in means = 0.4410 Upper confidence limit for difference in means = 7.5590