What type of sample is this and is it biased?

Question

The student council at school is responsible for surveying the students to determine whether they would prefer study halls or electives. Because 1740 students attend the school, the council decides to survey a sample. A student council member suggests that the four representatives from each class be surveyed during the next student council meeting. What type of sample is this? Is it biased? Explain your reasoning.

Answer 1

It is a convenience sample, and is likely to be biased because the student council members are probably not representative of the student population at large. Better to use a simple random or stratified random sample.