Notes
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- définitions :
--une population : ensemble des individus ,objets, caractères .... veut les observe statistiquement
en appelle une population par Ω et le nombre d'individus N ou bien cardinal de Ω (card(Ω)=N = 123)
--Unité statistique : est toute individu/objet qui compose une population statistique, que l’on note ω
--les caractères : (variables statistique ) :
1/ c. qualitatif : الصفات
a/ nominal : lorsque l’ordre de classement de modalité n’est pas important . ex : - Le groupe sanguin (A, B, AB et O).
b/ ordinale : : l’ordre dans le classement des modalités est important. ex : - La mention du BAC (assez-bien, bien, très-bien et excellent).
2/ c. quantitatif : اعداد
a/ discret : la variable ne peut prendre qu’une seule valeur d’un entier ex : nombre d'enfants
b/ continu : elle prend n’importe quelle valeur dans son domaine de définition : un nombre infini ex : taux de glycémie
--Effectifs et fréquences :
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