A newspaper selected 1.500 people from a random sample to receive a survey, and

Question

A newspaper selected 1.500 people from a random sample to receive a survey, and 130 people returned their survey to the newspaper. How could nonresponsive cause the results of this survey to be biased? Those who did not respond caused a violation of the assumption of independence. Those who did respond may differ in some important way from those who did not respond. Those who did not respond represented a classic example of disjoint probability. Those who did not respond were indistinguishable from those who did not receive the questionnaire.

Explanation / Answer

Correct ans is "b".

Non-response bias occurs in statistical surveys if the answers of respondents differ from the potential answers of those who did not answer.

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