Same-sex marriage: In a recent ABC News/Washington Post poll, 1220 adults nationwide answered the question, "Overall, do you support or oppose allowing gays and lesbians to marry legally?"

Of the respondents, 506 support same-sex marriage. What is the 95% confidence interval for the proportion of all American adults who support same-sex marriage?

http://www.washingtonpost.com/page/2010-2019/WashingtonPost/2015/04/23/National-Politics/Polling/release_395.xml

1. (0.387, 0.442)
2. (0.401, 0.429)
3. (0.392, 0.438)
4. (0.378, 0.451)