It means that people who don't know try to act as if they know, then when they truly believe what they are saying they are confident that they are correct.
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99.9 CI means that there is a 99.9% chance the CI limits contains the value you are looking for.
144 Americans.
The word "ignorance" occurs 18 times in 17 verses in the KJV bible.
Confidence level 99%, and alpha = 1%.
No. Doubt is the antonym of confidence.