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En una muestra de 105 comercios seleccionados al azar de una zona, se observa que 27 de ellos han tenido prdidas en este mes. Obtenga

En una muestra de 105 comercios seleccionados al azar de una zona, se observa que 27 de ellos han tenido prdidas en este mes. Obtenga un intervalo de confianza para la proporcin de comercios en la zona con prdidas, a un nivel de confianza a) del 80 % y a un nivel de confianza b) del 90%.

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