1.18 Margin of error and n A poll was conducted by Ipsos Public Affairs for Global News. It was conducted between May 18 and May 20, 2016, with a sample of 1005 Canadians. It was found 73% of the respondents “agree”

that the Liberals should not make any changes to the country’s voting system without a national referendum first. (http://globalnews.ca/news/). Find the approximate margin of error if the poll had been based on a sample of size

(a) n = 900,

(b) n = 1600, and

(c) n = 2500. Explain how the margin of error changes as n increases.