In a recent poll, 490 people were asked if they liked dogs, and 47% said they did. Find the margin of error of this poll, at the 99% confidence level.

Answer 1

ME = z-critical * sqrt(phat * (1-phat)/n), where phat = 0.47, n = 490 and z-critical is z-score for 0.995 probability (2.58)