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Jeff sends everyone in his high school a survey asking which of three student council candidates his peers will support. Out of $1,300$ students, $403$ returned completed surveys.
What is the biggest problem with Jeff’s survey technique?
Undercoverage is clearly present in this survey.
He didn’t ensure that males and females were equally represented in the response.
The data may exhibit non-response bias.
He should have done a matched pair analysis.
He didn’t talk to the respondents in person.