Critical Z (Z-critical) Value Calculator October 9, 2025 Aman Maths, Uncategorized Input mode: Confidence Level (two- or one-tailed) Significance Level α Advanced: Direct CDF probability p Confidence Level (e.g., 95): 90% 95% 99% Significance α (in %, e.g., 5 for 0.05): Standard normal CDF probability p (0 < p < 1): Tail type: Two-tailed Right-tailed Left-tailed Calculate Show Steps Show Details