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Se utilizan dos maquinas para llenar botellas de plastico con detergente para maquinas lavaplatos. Se sabe que las desviaciones estandar de volumen de llenado son

Se utilizan dos maquinas para llenar botellas de plastico con detergente para maquinas lavaplatos. Se sabe que las desviaciones estandar de volumen de llenado son 1 = 3.55 ml y 2 = 4.44 ml para las dos maquinas respectivamente. Se toman dos muestras aleatorias, 1 = 15 botellas de la maquina 1 y 2 = 12 botellas de la maquina 2 y se tiene que los volumenes promedio de llenado son 1 = 912.94 ml y 2 = 907.32 ml. Asumiendo que ambas muestras provienen de distribuciones normales. Construya un intervalo de confianza de nivel 95 % para la diferencia entre las medias del volumen de llenado.

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