In their research methods class, Hiba and Oscar have to compare and contrast a representative sample and a random sample and then present their answers to the class. After some conversation they tell the class, "Both random samples and representative samples are useful for , A contrast between the two is that, unlike representative samples, random samples require that the researchers ____
O case studies; have access to the entire sample
O case studies; have access to the entire population
O generalization; have access to the entire sample
O generalization; have access to the entire population