### Favor of the airlines e-mail idea

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An  airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to email during the flight. Of the 400 travelers surveyed,80 said e-mail access would be worth a slight extra cost.Construct a 95% confidence interval for the population proportion of air travelers who are in favor of the airline's e-mail idea.

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