Polls often conduct pre-election surveys by telephone
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Practice Problems

Polls often conduct pre-election surveys by telephone

4. Polls often conduct pre-election surveys by telephone (land/cell).

a. Could this bias the results? Justify your answer

b. What if the sample is drawn from the telephone book or random generated google list?

Hint
StatisticsIn research, bias occurs when “systematic error [is] introduced into sampling or testing by selecting or encouraging one outcome or answer over others” 7. Bias can occur at any phase of research, including study design or data collection, as well as in the process of data analysis and publication.  Bias, prejudice mean a strong inclination of the mind or a preconceived opinion about...

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