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CC rangueil 2016 QCM 7E - intervalle de confiance


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Posted

Hello,

 

à retenir : quand alpha diminue et/ou quand n diminue, l'amplitude de l'intervalle de confiance ou Pari augmente.

Dans la formule tu as : [X - ualpha*Y ; X + ualpha*Y].

 

Si alpha = 5%, ualpha = 1.96 (valeur usuelle de la loi Normale). Si tu diminues alpha, ualpha augmente (encore une fois c'est la courbe de la loi Normale) donc l'amplitude de l'intervalle augmente !

 

Dac ?

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