Response on a survey

Write a 500+ word response in a paragraph form answering these questions (1-2):
Describe the way that the Literary Digest and George Gallup conducted their surveys on the presidential election of 1936. Why was one so much more accurate than the other? What can this tell you more generally about how to conduct an accurate survey?
How does question-wording affect survey results? What are some of the safeguards that survey researchers must use to assure that their wording is not overly affecting the results?

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