# 12.2: 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
Table A.1: Normal Critical Values for Confidence Levels

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

12.2: Normal Critical Values for Confidence Levels is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Kathryn Kozak via source content that was edited to conform to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.