12.2 Normal Critical Values for Confidence Levels

Table A.1: Normal Critical Values for Confidence Levels
Confidence Level, C	Critical Value, $Z_{c}$
99%	2.575
98%	2.33
95%	1.96
90%	1.645
80%	1.28

Critical values for $Z_{c}$ created using Microsoft Excel

Adapted from Statistics with Technology, 2nd Edition, by Kathryn Kozak (Coconino Community College), © Kathryn Kozak, licensed under CC BY-SA 4.0. Changes were made. License: CC-BY-SA-4.0.