Question

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?
○ no, it is not biased. all residents of the town will have the opportunity to respond.
○ 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.
○ yes, it is biased. only certain parts of the town were surveyed.

Explanation:

This is a question about survey bias. The study uses random door-knocking across different town parts, so all residents have a chance to be selected. Non-response (people not wanting to answer) is a non-response issue, not inherent bias in the sampling method, and the option claiming only certain parts were surveyed is incorrect as the problem states different parts are included.

Answer:

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