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On a prlev d'une base de donnes d'une grande entreprise de service, un chantillon alatoire de 38 employs de niveau cadres intermdiaires. Les employs ont

On a prlev d'une base de donnes d'une grande entreprise de service, un chantillon alatoire de 38 employs de niveau "cadres intermdiaires". Les employs ont t regroups selon le sexe. Suite une discussion avec un cadre du dpartement des ressources humaines affirmant que le salaire des cadres de sexe fminin est infrieur ceux de sexe masculin, on veut comparer le salaire annuel moyen selon le sexe de l'employ. Utilisant un seuil de signification de 1%, on obtient le rapport Excel suivant: Test d'galit des esprances pour deux populations de variances gales Masculin Fminin Moyenne 41997.0 40443.4 Variance 919152.095 865607.729 Observations 22 16 Variance pondre Diffrence hypothtique des moyennes Degr de libert Statistique t P(T<=t) unilatral Valeur critique de t (unilatral) P(T<=t) bilatral Valeur critique de t (bilatral) Quelle est la valeur de la variance pondre pour ce test? On suppose que les donnes obtenues pour chaque groupe d'employs sont distribues normalement avec variances inconnues mais supposs gale une variance commune s2 . Question 10 options: 896841,943 1303,73 982541,48 1294778,65 947,02 1699722,83

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