Pratique des Biostatistiques
Accueil › Notions générales de statistique › Probabilités
 Dernière modification: 16 avril 2010

Convention: les évènements

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  • strict warning: Non-static method view::load() should not be called statically in /home/iamin/www/umdb/biostats/sites/default/modules/views/views.module on line 906.

Les probabilités vues dans ce cours font intervenir des évènements.

Par exemple imaginons d'étudier des drosophiles, et, plus particulièrement, la couleur des yeux et la taille des ailes.

Afin de simplifier les équations à venir, l'évènement "avoir des ailes normales" est noté A et l'évènement "avoir des yeux rouges" est noté B.

L'évènement A ("avoir des ailes normales") est opposé à A* c'est-à-dire "avoir des ailes anormales". De même, l'évènement contraire de B ("avoir des yeux rouges") est noté B* et représente le fait d'avoir "des yeux d'une autre couleur que rouge".

En pratique, si la probabilité d'avoir des ailes normales dans la population de drosophiles est de 30%, cela implique qu'il y a 70% des drosophiles qui ont des ailes différentes de la normale (courtes, courbées, doubles, etc.). On écrira alors:

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