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8. Durante 2002, los universitarios que trabajan y estudian ganaron una media de 1252 dlares. Suponga que una muestra formada por 45 estudiantes de una

8. Durante 2002, los universitarios que trabajan y estudian ganaron una media de 1252 dlares. Suponga que una muestra formada por 45 estudiantes de una universidad grande que trabajan arroj que haban ganado una media de 1277 dlares durante este ao, con una desviacin estn dar de 210 dlares. Una prueba de una cola con un nivel de significancia de 0.05 sugerira que la ganancia promedio de los estudiantes de esta universidad fue significativamente ms alta que la media nacional?.

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