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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 136 que pasaron en la prueba inicial. Sugiere esto que la proporcin verdadera en este condado durante el ao en curso es diferente de la proporcin a nivel estatal previa? Pruebe las hiptesis pertinentes con a = 0.05.

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