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El departamento de estadstica instal, el ao pasado, luces, calentadores y aire acondicionado eficientesen el consumo de energa. Ahora desean determinar si el consumo promedio

El departamento de estadstica instal, el ao pasado, luces, calentadores y aire acondicionado eficientesen el consumo de energa. Ahora desean determinar si el consumo promedio mensual de energa ha disminuido. Deben realizar una prueba de una o de dos colas? Si el consumo promedio mensual anterior era 3,124 kilowatts hora, cules son la hiptesis nula y alternativa?

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