td9intervalleconf.py

Created on May 27, 2025

418 Bytes

n=25

xbar= 12 moyenne

sn'= 0,6 (ecart type)

ESB m = xbar

pour trouver l'ESB de la var : 
  
  racine carré de  ESB de sn car ecart type = :
  Sn^2 = 1/n-1 (sn')^2 = ESB 
  
  
IC. A 95% : 

IC(1-alpha)= ( xbar-tSN/racine(n) ; xbar+tSn/racine(n))


1-alpha = 0,95 

pour trouver t : F(t)=1-alpha/2

on trouve F(T) puis tableau à n-1


pour n>30

Sn' = Sn donc pas besoin de faire la manip

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td9intervalleconf.py