Each peson in a simple rando sample of 1,000 received a questionair, and 210 peo

Question

Each peson in a simple rando sample of 1,000 received a questionair, and 210 people returned their questionaire to teh researcher. How could nonresponse cause the results of this survey to be biased?

a. those who did not respond caused a violation of the assumption of independence

b. those who did respond may differ in some important way fromt hsoe who did not respond.

c. those who did not respond were indistinguishable from those who did not receive the questionaire

d. those who did not respond reduced the sample size below an acceptable level to make inference

Explanation / Answer

answer

c. those who did not respond were indistinguishable from those who did not receive the questionaire

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