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4 Una muestra de doce medidas de resistencia al rompimiento de hebras de algod6n dieron una media de 7.30 onzas y desviaci6n estndar de

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4 Una muestra de doce medidas de resistencia al rompimiento de hebras de algod6n dieron una media de 7.30 onzas y desviaci6n estndar de 1.24 onzas. Encuentre los limites de confianza (a) 95% (b) 99% para la resistencia media verdadera al rompimiento.

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