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Suppose it has been estimated that the rate of caries is 800 per 1000 school children...

Suppose it has been estimated that the rate of caries is 800 per 1000 school children in one district and 600 per 1000 in another district. How large a sample of children from each district is required to determine whether this difference is significant at the10% level if we wish to have an 80% chance of detecting the difference if it is real?

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