An ABC News Poll in 2004 surveyed 1,501 randomly selected U.S. adults and asked

Question

An ABC News Poll in 2004 surveyed 1,501 randomly selected U.S. adults and asked if they believed it is more enjoyable to be married or single. In the survey, 75% of the people responded that they believed it is more enjoyable to be married than single. Choose the correct interpretation for the 98% confidence interval for the population proportion.

a. We are 98% confident that the proportion of adults in the United States who believe it is more enjoyable to be married than single is between 0.7250 and 0.7770.

b. We are 98% confident the proportion of adults polled who believe it is more enjoyable to be married than single is between 0.7250 and 0.7770.

c. In 98% of all samples, the proportion of adults polled who believe it is more enjoyable to be married than single is between 0.7250 and 0.7770.

d. The proportion of adults in the United States who believe it more enjoyable to be married than single is between 0.7250 and 0.7770.

Explanation / Answer

The 98% confidence interval for the population proportion here means that there is a 0.98 probability that the proportion of adults in the United States who believe it is more enjoyable to be married than single is between 0.7250 and 0.7770. Therefore a is the correct answer here.

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