Quarter Hour Audience – Individuals viewing a station at least five minutes in a specific 15-minute period.

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Quintile – Any of five equal classes or groups within a sample; for example, the heaviest viewing quintile within a sample.

Quota Sample – A sample in which desired sample size or quotas are established for various universe subclasses (controls). The purpose is to insure the characteristics of the sample being examined are distributed in proportion to the characteristics of the total population. Choice of controls vary depending on the survey objectives. Selections of sample elements are not random selections. The probability of selecting an element is often unknown. Some elements may not have any chance of being selected.

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