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Se obtuvo una muestra aleatoria de 12 cajeros de banco y se determin que cometan un promedio de 3.6 errores por da con una desviacin

Se obtuvo una muestra aleatoria de 12 cajeros de banco y se determin que cometan un promedio de 3.6 errores por da con una desviacin estndar muestral de 0.42 errores.Construya un intervalo de 90%de confianza para la media de la poblacin de errores por da. Qu suposicin est implcita acerca del nmero de errores que cometen los cajeros?

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