A researcher who is conducting an opinion survey asks viewers who are watching a political debate to dial an 0-800 number and record their opinion to the "question of the day". In this case the researcher is likely to have

Question

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The sample is likely to be biased because only viewers who are currently watching the political debate are able to respond to the survey, potentially excluding individuals who do not have access to television or are not interested in politics. Additionally, the use of an 0-800 number may affect the sample, as individuals who do not have access to landlines or who are not comfortable with technology may be excluded.

A Researcher Who Is Conducting an Opinion Survey Asks Viewers