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Se toma una muestra de 250 observaciones de una poblacin con una desviacin de 25. La media de la muestra es de 20. Determina el
Se toma una muestra de 250 observaciones de una poblacin con una desviacin de 25. La media de la muestra es de 20.
- Determina el error estndar de la media al 80% de confianza.
- Determina el intervalo al 95 % de confianza.
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