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The Centers for Disease Control reported the percentage of people 18 years of age and older...

The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke (CDC website, December 14, 2014). Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .35 :

A sample of 2185 is taken with a margin of error of .02 by using 95% confidence. The sample size recommendation of 2185 finds 520 smokers. A point estimate of the proportion of smokers is 0.2380

What is the 95% confidence interval for the proportion of smokers in the population (use 4 decimals)?

( 0.____ , 0.____ )

Math   Statistics-And-Probability   
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