In 2006, a survey reported that the percentage of people in a university who reported a lot of, or some confidence

(instead of not too much, or no confidence) in the elected Student Body President was 15% in House Red, 29% in House Blue, 26% in House Green, and 5% in House Yellow. In 2014, the corresponding percentages reported for the new president were 85%, 71%, 73%, and 56%. The reported margin of error in House Yellow was 1.5% for the 2006 result and 3.0% for the 2014 result. Find the approximate sample size in HouseYellow for the studies.