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Self confidence is being able to conduct yourself clearly and with certainty in everything that you do.
Confidence means to have trust or belief in something. Synonyms for the word "confidence" include, sureness, poise, reliance, aplomb, assurance, faith, and trust.
99.9 CI means that there is a 99.9% chance the CI limits contains the value you are looking for.
Confidence level 99%, and alpha = 1%.
Why confidence interval is useful