PART III
Samples
The tendency of the casual mind is to pick out or stumble upon a sample which supports or defies its prejudices, and then to make it the representative of a whole class.
—Walter Lippmann
The raw data may provide all the information that is required and therefore undergo no subsequent processing. In most situations, however, this will not be so. The data may be too extensive to be readily appreciated and may require summarizing. It is essential that the summarizing be done in a suitable manner so that it represents the original data in a fair way. Processing may then be required to estimate the characteristics of the population from which the data were drawn.
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