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Vous régressez la consommation d'un produit (en kg consommés par an) sur le revenu de la personne et « femme » (variable dichotomique qui vaut 1 si l'individu est une femme, 0 sinon). Vous constatez que la consommation augmente avec le revenu (le coefficient de « revenu » est positif). Vous suspectez que la hausse de la consommation avec le revenu est plus forte pour les hommes que pour les femmes (une femme qui a un revenu de 2500 euros par mois consomme un peu plus qu'une femme qui gagne 2200 euros par mois, un homme qui gagne 2500 euros par mois consomme beaucoup plus qu'un homme qui gagne 2200 euros par mois)?Quelle variable introduisez-vous dans la régression pour vérifier si vous avez raison ?Quelle sera le signe de son coefficient si vous avez raison ?

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