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Cuntos viajeros deben seleccionarse al azar para estimar el tiempo medio de conduccin de los viajeros de Chicago? Queremos un 98% de confianza de que

Cuntos viajeros deben seleccionarse al azar para estimar el tiempo medio de conduccin de los viajeros de Chicago? Queremos un 98% de confianza de que la media de la muestra est dentro de los 2 minutos de la media de la poblacin, y se sabe que la desviacin estndar de la poblacin es de 10 minutos.

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