Results of a poll of a random sample of 3003 American adults showed that 20% did not know that caffeine contributes to dehydration. The poll was conducted for the Nutrition Information Center and had a margin of error of ±1.4%.
(a) Does the margin of error take into account any problems with the wording of the survey question, interviewer errors, bias from the sequence of questions, and so forth?
(b) What does the margin of error reflect?