Question

At a football game, a researcher randomly asks 100 people to name their favorite sport. Is this a biased sample?

Answer 1

Yes, this is biased.

Explanation:

This sampling technique is called convenient sampling, because the researcher's sampling frame is limited to a particular kind of people, i.e, people who visit that football game. This sample over represent football fans. It would not be surprising if this sample results the researcher to conclude that football is the most favorite sport.