It can be shown (proof omitted) that as the sample size n increases, the T distribution tends to normality and the value t_α, such that P(T > t_α) = α, approaches the value z_α, such that P(Z > z_α) = α. Use Table 7 of Appendix B to verify that as the sample size n gets infinitely large, t_.05 = z_.05, t_.025 = z_.025, and t_.01 = z_.01.