In a recent poll of 800 homeowners in the United States one

In a recent poll of 800 homeowners in the United States, one in five homeowners reports having a home equity loan that he or she is currently paying off. Using a confidence coefficient of 0.95, derive an interval estimate for the proportion of all homeowners in the United States that hold a home equity loan.

Solution

0.223868

Confidence interval =(0.176,0.224)