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Nonresponse
selected people do not respond
Undercoverage
systematically excluding people from being able to be selected
Response bias
providing inaccurate responses (on purpose or accident)
Wording Issues
confusing, question is slanted towards a particular response
voluntary bias
when the people who choose to take part in a study are different from the rest of the population—like having stronger opinions, special interests, or different experiences
convnience sampling
when you choose people who are easiest to reach or get for your study
overestimate bias
happens when the results of a study or survey show a higher number or stronger effect than what is actually true in the real world
underestimate bias
happens when the results of a study or survey show a lower number or weaker effect than what is actually true