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6. In December 2012 Gallup Poll conducted a survey of 1,015 Americans to determine if they...

6. In December 2012 Gallup Poll conducted a survey of 1,015 Americans to determine if they had delayed seeking healthcare treatment due to the associated costs. Of the participants, 325 reported delaying seeking treatment due to costs. Create a 95% confidence interval for the proportion of all Americans who have delayed seeking healthcare treatment due to costs. Interpret your interval.

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Solution: The 95% confidence interval for the proportion of all Americans who have delayed seeking healthcare treatment due to costs is:

Therefore, the 95% confidence interval for the proportion of all Americans who have delayed seeking healthcare treatment due to costs is

There is a 95% chance that the confidence interval calculated contains the true population proportion.

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