During the 2012 presidential election, news sources are reported that polls indicated that 59% of the population supported Obama for reelection. In addition, sources indicated a margin of error of 4%. Which of the following was the confidence interval?
A)55-63
B)4
C)63-67
D)2

Question

Quizplus · Accepted Answer

The confidence interval is calculated by taking the reported percentage (59%) and adding and subtracting the margin of error (4%). This gives us a range from 55% to 63%.

During the 2012 Presidential Election, News Sources Are Reported That