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A pollster is interested in the approval rating of a congressman in his district.

Using an address book to select households randomly within the representative’s constituency, the pollster went from door to door and asked, “Do you approve of your United States representative?”

What is a potential bias the pollster may encounter?


The wording of the question.


The constituents may not be informed on the representative.


The sample was stratified on homeownership when it should not be.


The pollster is leaving out any constituents who are homeless or have unlisted addresses.


Some of these constituents may not be eligible to vote.

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