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Statistique Qubec souhaite dterminer si le taux de syndicalisation varie selon le sexe. En interrogeant 5000 travailleurs d'usine choisis au hasard, cet institut a

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Statistique Qubec souhaite dterminer si le taux de syndicalisation varie selon le sexe. En interrogeant 5000 travailleurs d'usine choisis au hasard, cet institut a appris que 785 d'entre eux taient syndiqus. De mme en interrogeant 3000 travailleuses d'usine choisies au hasard, il a appris que 327 d'entre elles taient syndiques. 1. tablir un intervalle de confiance 99% pour la diffrence de proportions entre les hommes et les femmes. 2. L'intervalle calcul en 1) vous porte-t-il croire que le taux de syndicali- sation varie selon le sexe de faon significative? Justifier votre rponse.

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