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In a region of Costa Rica with 16,900 families, it is desired to determine the proportion of family heads who are salaried workers, not having

In a region of Costa Rica with 16,900 families, it is desired to determine the proportion of family heads who are salaried workers, not having any idea of such proportion. It is desired that the sampling error is not greater than 3.0% and the confidence in the inferences is 90%. Calculate the recommended minimum sample size.

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