nag_stat_inv_cdf_normal (g01fac) Example Program Results Tail Probability Deviate Nag_LowerTail 0.975 1.9600 Nag_UpperTail 0.025 1.9600 Nag_TwoTailConfid 0.950 1.9600 Nag_TwoTailSignif 0.050 1.9600