Polls of public opinion Two methods of sampling are practiced by the polls,random and 9 3 8 4. quota sampling.The former consists 65 in selecting persons to be interviewed at random.Quota sampling involves selecting a sample of people which is representative of the population in terms of age, occupation,sex,region and so on. Polls of public opinion ◼ Two methods of sampling are practiced by the polls, random and quota sampling. The former consists in selecting persons to be interviewed at random. Quota sampling involves selecting a sample of people which is representative of the population in terms of age, occupation, sex, region and so on