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Los registros estatales de verificacin de emisiones indican que, de todos los vehculos verificados durante el ao anterior, el 70% pasaron en el primer intento.

Los registros estatales de verificacin de emisiones

indican que, de todos los vehculos verificados durante

el ao anterior, el 70% pasaron en el primer intento.

Una muestra de 200 carros probados en un condado

particular durante el ao en curso da 124 que pasaron

en la prueba inicial. Sugiere esto que la proporcin

verdadera en este condado durante el ao en curso

difiere de la proporcin a nivel estatal previa? Pruebe

las hiptesis pertinentes con = 0.05. Halle el valor P.

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