TBW
95% 신뢰 1.96
99% 신뢰 2.58? chk
99% 신뢰 2.58? chk
95% 신뢰구간: -1.96 ≤ Z ≤ 1.96
AKA 신용구간
tmp twins:
https://en.wikiversity.org/wiki/Confidence_interval
https://everything2.com/title/Confidence Interval
https://en.citizendium.org/wiki/Confidence_interval
https://en.wikiversity.org/wiki/Confidence_interval
https://everything2.com/title/Confidence Interval
https://en.citizendium.org/wiki/Confidence_interval