In a study of 740 pay telephones in New York City underground subway stations, it was found

Question:

In a study of 740 pay telephones in New York City underground subway stations, it was found the 229 were not functioning. Construct a 95% confidence interval estimate of the proportion of all such pay telephones that are not functioning. Based on the result, what can we conclude about a claim that 25% of all such telephones are not functioning?