If all visitors to the CNN Web site are invited to take part in the daily poll online,is the resulting sample likely to be biased?
A) No,this will result in a simple random sample.
B) No,although this sample would not be random,it would definitely be representative of the population.
C) Yes,the sample is likely to suffer from non-response and self-selection bias.
D) More information is needed to answer the question.

Question

Quizplus · Accepted Answer

All visitors to the CNN website do not necessarily represent the entire population, and there is a possibility of self-selection bias as people who choose to take part in the poll may have different characteristics than those who do not participate. Additionally, non-response bias may occur if certain groups of people are more likely to respond to the poll than others. Therefore, the resulting sample is likely to be biased.

If All Visitors to the CNN Web Site Are Invited