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On veut tester l'efficacit d'un nouveau type de semence. Pour ce faire, on choisit 20 champs situs dans 20 municipalits diffrentes. On plante alors la

On veut tester l'efficacit d'un nouveau type de semence. Pour ce faire, on choisit 20 champs situs dans 20 municipalits diffrentes. On plante alors la nouvelle semence dans 10 de ces champs et l'ancienne dans les 10 autres (tous choisi de faon alatoire). Les deux chantillons obtenus sont donc apparis.

Explication?

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