In a recent poll that included questions about illegal immigration into the United States, and the federal and state responses to the problem, 75% of the n = 1004 adults surveyed felt that the United States is not doing enough to keep illegal immigrants from coming into this country.
a. What is a point estimate for the proportion of adults who feel that the United States is not doing enough to keep illegal immigrants from coming into this country? Calculate the margin of error.
b. The poll reports a margin of error of ± 3.5%. How should the reported margin of error be calculated so that it can be applied to all of the questions in the survey? Is the reported margin of error correct?