All Visitors to the CNN Website Are Invited to Take

Multiple Choice

All visitors to the CNN website are invited to take part in the daily poll.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 nonresponse and self-selection bias.
D) More information is needed to answer the question.