In August 2006, a trade group for liquor retailers put out a press release with the headline, “Millions of Kids Buy Internet Alcohol, Landmark Survey Reveals.” Further details revealed that in an Internet survey of 1001 teenagers, 2.1% reported that they had bought alcohol online. In such a study, explain how there could be
a. Sampling bias.
b. Non-response bias, if some teenagers refuse to participate.
c. Response bias, if some teenagers who participate are not truthful.