Practice Test

Question 9 • Algebra II

A utility company hires pollsters to knock on random doors in different parts of town to survey residents about the cost of their electric bill. Would this study be biased? Why or why not?

Answer

Yes, it is biased. Only certain parts of the town were surveyed.

Yes, it is biased. Some of the residents who are surveyed may not want to respond to someone who knocks at their door.

No, it is not biased. All residents who are surveyed will want to respond.

No, it is not biased. All residents of the town will have the opportunity to respond.

Explanation

Yes, the survey could be biased because some residents may choose not to answer the door or may not want to respond. This is nonresponse bias: people who respond may differ from those who do not. Surveying random doors in different parts of town does not ensure that everyone will participate, so choice A is correct.

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