question archive In a random sample of 300 senior citizens, 210 are wearing hearing aides

In a random sample of 300 senior citizens, 210 are wearing hearing aides

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In a random sample of 300 senior citizens, 210 are wearing hearing aides. How large a sample is needed if we want to be 95% confident that the sample proportion is within 0.02 of the true proportion of senior citizens ?

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