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VII). Se tom una muestra aleatoria de rentas mensuales de departamentos de una recamara en una ciudad grande para estimar la renta promedio. Suponga quen=800,=235.10

VII). Se tom una muestra aleatoria de rentas mensuales de departamentos de una recamara en una ciudad grande para estimar la renta promedio. Suponga quen=800,=235.10 ys=47.55 dlares.

a) EncuentreEtal que podamos tener un 85% de confianza en que difiere deen menos queE

b) Estime construyendo un intervalo del 85% de confianza

c) Si se usa scomo estimacin puntual de , encuentre el tamao de muestra necesario para tener un 85% de confianza en queEes menor que 5.

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