A researcher worked with members of a political action committee (PAC) to survey potential voters by telephone before an election. PAC members conducted the poll themselves while the researcher tabulated the results
The poll asked which candidate people plan to vote for in the upcoming election. Which of the following may present problems for the accuracy of the results?
A) None of these will present problems for the accuracy of the results.
B) One question was "Do you plan to vote for Candidate A or Candidate B?"
C) The survey was scheduled to coincide with a large rally for one candidate.
D) All of these may present problems for the accuracy of the results.
E) The sample of potential voters was taken from telephone directories only.
Answer: D
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