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I Se desea estimar el ingreso promedio de las familias de una zona especfica de Costa Rica con poblacin de 7400 familias. En un estudio

I

Se

desea

estimar

el ingreso promedio de las

familias

de

una

zona especfica

de

Costa

Rica con poblacin

de

7400

familias.

En

un

estudio

anterior se haba determinado la desviacin estndar en 18400.

Si

se

desea

que el error de muestreo no est por encima

de

1000, calcular

un tamao de muestra en donde las

inferencias tengan un 95% de confianza.

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