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El fabricante de un artculo afirma que la resistencia media de su artculo tiene distribucin normal con una desviacin estndar de 0,5. Una muestra aleatoria

El fabricante de un artculo afirma que la resistencia media de su artculo tiene distribucin normal con una desviacin estndar de 0,5. Una muestra aleatoria 4 observaciones produjo los siguientes resultados de su resistencia: 5,2; 4,3; 3,7; 3,9; 5,7. Realice una prueba con 5% de significancia para determinar si la desviacin estndar especificada por el fabricante es cierta.

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