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Los precios de la gasolina se incrementaron de manera notable de 1990 a 1994. En una pgina de internet se public informacin del precio promedio

Los precios de la gasolina se incrementaron de manera notable de 1990 a 1994. En una pgina de internet se public informacin del precio promedio por litro para la gasolina normal sin plomo en los dos aos. Supn que se obtuvieron los resultados que se proporcionan en la tabla que aqu se presenta, a partir de muestras independientes de lugares en todo el pas. Calcula la estimacin del intervalo de confianza de 95% del incremento en trminos absolutos del precio promedio por litro de 1990 a 1994:

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