Answer:
Step-by-step explanation:
I wouldn't consider it biased, but I'll bet a stats person would. Their reason would be that those who enter the cafeteria are select segment of a school population.
- What about the kids who go to clubs at noon? or other activities.
- What about those who are only there part time and have jobs or just go home at noon?
- What about those who bring lunches and want to sit outside or even in their cars if they have one?
- What about those who are serving detentions?
Those are just four exceptions. There must be others -- like a staggered lunch period.
