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In a large sample study according to a report by the U.S.surgeon general, electrical engineers have...

In a large sample study according to a report by the U.S.surgeon general, electrical engineers have the lowest smoking rate among all workers surveyed. Only 16% of the male electrical engineers in the sample smoke cigarettes regularly. How many male electrical engineers must be sampled to estimate the proportion of fall male electrical engineers who smoke regularly to within 3% of its true value with 95% confidence?

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