Based on survey of a representative sample of 1000 adult Americans, YouGov estimated that the proportion of adult Americans who have less than $1000 in savings is 0.430 (“People More Likely to Save with an Opt-Out System,” today.yougov.com  /news/2016/04/25/savings/). The margin of error for a 95% confidence level associated with this estimate is 0.03. Show how this margin of error was calculated.