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Una compaa productora de combustibles asegura que una quinta parte de los hogares en una cierta ciudad se calientan con petrleo. Se tiene alguna razn

Una compaa productora de combustibles asegura que una quinta parte de los hogares en una cierta ciudad se calientan con petrleo. Se tiene alguna razn para dudar de esta afirmacin si, en una muestra aleatoria de 1000 hogares en esta ciudad, se encuentra que 236 se calientan con petrleo? Utilice un nivel de significancia de 0.01.

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