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?

The pollsters select residents by knocking on random doors, but some people may not answer or may choose not to take part. If those residents differ from people who respond, the survey results could be biased by nonresponse. So the best choice is “Yes, it is biased. Some of the residents who are surveyed may not want to respond to someone who knocks at their door.”

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