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J'ai une population d'employés dans une usine, qui fabrique en moyenne 100 unités par jour. Je donne une formation à un petit échantillon d'employés. Ils produisent maintenant 111 unités par jour. Je veux savoir si la différence est assez grande pour dire qu'ils appartiennent maintenant à une nouvelle population. Quel type de test t dois-je effectuer pour obtenir la réponse ?
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