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Se requiere hacer un estudio sobre el gasto semanal medio en un cantn con 20.000 familias. Se sabe que la dispersin del gasto en unidades

Se requiere hacer un estudio sobre el gasto semanal medio en un cantn con 20.000 familias. Se sabe que la dispersin del gasto en unidades al cuadrado es 1760. Con un nivel de confianza del 95% el tamao de la muestra para estimar la media con un error de 8 dlares es:

a.105

b.3

c.380

d.400

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