Posted by **Rosa** on Tuesday, February 8, 2011 at 12:49am.

Data in 1980 showed that about 48% of the adult population had never smoked cigarettes. In 2004, a national health survey interviewed a random sample of 5000 adults and found that 54% had never been smokers. Create a 95% confidence interval for the proportion of adults in 2004 who had never been smokers.

How would you solve this by hand and/or calculator?

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