Determine whether or not a sample is biased

Question

Is it biased or unbiased and why.....

 

Courtney wants to find out which class is most popular among the 7th and 8th grade students at her middle school. She chose to randomly survey every ten students.

Answer 1

Since Courtney did not in any way set up ahead of time a particular group to survey..., i.e., her sample set is actually random..., then the survey is unbiased.