SAT Math· difficulty 5/5
A survey is mailed to 1000 random households; 250 respond. The non-response of 75% may cause:
Non-response bias if respondents differ systematically from non-respondents
Margin of error becomes 0
No bias since the original sample was random
Larger confidence intervals only
Explanation
Low response rate causes non-response bias if those who respond differ from those who don't.
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