Question

Each person in a simple random sample of 1,500 received a survey, and 412 people returned their survey. How could nonresponse cause the results of the survey to be biased?

Answer 1

Answer:

Those who did not respond may differ in some important way from those who did respond.

Answer 2

Those who did not answer may different from others who responded in some significant ways.

If a survey was sent to each of the 1,500 persons in a simple random sample, and 412 people returned it, the individuals who returned or not fill their survey had different thoughts than those who did not.

So, 412 people have different mind sets.

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