Every year the CDC conducts phone surveys to assess the health risks of people in the U.S. This survey is abbreviated BRFSS, which stands for Behavioral Risk Factor Surveillance System. Review the following data collected for 2009:
|
Total number of respondents
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Number of respondents who smoke everyday
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Number of respondents who smoke some days
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Number of respondents who are former smokers
|
Number of respondents who have never smoked
|
|
426,000
|
426,000
|
21,581
|
110,060
|
143,619
|
1. Calculate the proportion of each group of respondents.
2. Calculate the confidence interval for the proportion of respondents who stated they are former smokers.