
Taken from http://www.qualtrics.com/blog/are-you-practicing-random-selection/
In some situations, one person might desire to know something about some other people, whether it be the amount of money they make, the number of books they have read, the percentage of them who buy a certain product, or whatever this person might fancy to know. If the population considered is small enough and can be divided into groups with names that do not call for more clarification, it might not be too much of a problem to go and find this information by asking each person, assuming he or she tells the truth, and make claims about these groups.
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