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1.1 Variables and Data

Definition: A variable is a characteristic that changes or varies over time and/or different individuals or objects under consideration.

Examples: Weight, stock prices, height,  price of gasoline

Definition: An experimental unit is the individual or object on which a variable is measured.

A single measurement or data value results when a variable is actually measured on an experimental unit, e.g., the price of gas of a particular type at a particular station on a particular day, the price of a particular stock issue on a particular day at closing.

Definition: A population is the set of all measurements of interest to the investigator.

©1998 Brooks/Cole Publishing/ITP

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