Illegal Immigration Exercise 8.19 discussed a research poll conducted for ABC News and the Washington Post that included questions about illegal immigration into the United States, and the federal and state responses to the problem.3 Suppose that you were designing a poll of this type.
a. Explain how you would select your sample. What problems might you encounter in this process?
b. If you wanted to estimate the percentage of the population who agree with a particular statement in your survey questionnaire correct to within 1% with probability .95, approximately how many people would have to be polled?
Reference:
Illegal Immigration 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.3
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?
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