Information and IdeasVery hardMain idea of a passage on weighting a survey
Information and Ideas practice question
Critics of the survey noted that it was conducted online and that the old and the poor answer online surveys less often. The authors replied that they had weighted the responses to match the census. Weighting, however, corrects for who answers only if those who answer resemble those who do not, and a person who completes an online survey about loneliness may differ from one who does not in precisely the way that matters.
Which choice best states the main idea of the text?
- A. Weighting cannot repair a survey's sample if the people who answer differ from those who do not in the very trait being measured.Correct
- B. The survey's authors refused to weight their data.
- C. Online surveys are always reliable.
- D. The old and the poor are not lonely.
Answer: A. Weighting cannot repair a survey's sample if the people who answer differ from those who do not in the very trait being measured.
Weighting assumes a resemblance that loneliness may break.
Why the other answers are wrong
- B. The survey's authors refused to weight their data.
- They did weight it.
- C. Online surveys are always reliable.
- The text questions this one.
- D. The old and the poor are not lonely.
- Not claimed.
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