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Tema 3.11. Se quiere comprobar si la variabilidad en la duracin de unas lmparas marca A, se comporta de la misma manera que la duracin

Tema 3.11. Se quiere comprobar si la variabilidad en la duracin de unas lmparas marca A, se comporta de la misma manera que la duracin de otras lmparas de la marca B (de la competencia). Para tal fin, se toma una muestra aleatoria de 13 lmparas de la marca A, y se encuentra que la desviacin estndar s=8, mientras que en otra muestra aleatoria de 13 lmparas de la marca B, se encuentra que la desviacin estndar s=4. Se pide probar la hiptesis nula, de que la variabilidad es igual en ambas poblaciones, con un nivel de significancia del 5%.

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