A political candidate feels that she performed particularly well in the most recent debate against her opponent. Her campaign manager polled a random sample of 400 likely voters before the debate and a random sample of 500 likely
voters after the debate. The 95% confidence interval for the true difference (post-debate minus pre-debate) in
proportions of likely voters who would vote for this candidate was (-0.014, 0.064). What is the margin of error for this
confidence interval?
0.064 +(-0.014) = 0.025
2
0.064-(-0.014)
2
= 0.039
0 0.064 + (-0.014) = 0.050
O 0.064 - (-0.014) = 0.078