The owner of a factory that employs half the citizens in a small town is trying to decide whether to take a public stand on a controversial issue. He realizes that he would benefit from knowing how the townspeople feel. He randomly selects 50 of the townspeople from a list of all the town's population. He personally contacts all 50 and asks them their opinion on the issue. Most give him an answer, but 12 townspeople decline to participate. He decides to summarize his results based on the 38 responses. Which of the following list the most significant sources of bias in this survey?
A) Response bias and undercoverage
B) Response bias and nonresponse
C) Voluntary response bias and nonresponse
D) Nonresponse and undercoverage
E) Voluntary response bias and undercoverage
Answer: response bias and nonresponse
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