The percent of Americans saying that a television set is a necessity has dropped dramatically in recent years. In a nationwide survey conducted in May 2010 of 1484 people ages 18 and older living in the continental United States, only 42% say that a television set is a necessity rather than a luxury. The article goes on to say "the margin of error is plus or minus 3.0 percentage points." Use the information from this article to find an interval estimate for the proportion of people 18 and older living in the continental United States who believe that a television set is a necessity.