Respuesta :
20 random students in the hall.
If they are coming out of a ball the sample can be biased because they (more than likely) like to dance. The cheerleader are only a small population (cheerleading is dance oriented as well.) Teachers won't know for sure.
If they are coming out of a ball the sample can be biased because they (more than likely) like to dance. The cheerleader are only a small population (cheerleading is dance oriented as well.) Teachers won't know for sure.