Sir Conan Doyle, the creator of Sherlock Holmes, has an interesting view with respect to probability theory:

"While the individual man is an insoluble puzzle, in the aggregate he becomes a mathematical certainty. You can, for example, never foretell what any one man will be up to, but you can say with precision what an average number will be up to. Individuals vary, but percentages remain constant."

The size of sample does not determine if it good or bad quality. Its representativeness is more important than its size, that is, the degree of similarity with the population being studied.

Thus, all social groups and the various geographical regions should appear in the sample to the closest extent possible to surveyed population.


 

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