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Variable
2. Being different in structure, function, form, or behavior.
3. Tending to change. Variable comes from the Latin word "vario" meaning "to change."
1. Any characteristic or quantity in an experiment that tends to vary (change) or take on different values while other factors or conditions remain constant (unchanging). For example, age can be a variable if an experimenter tested people of different ages. However, age can also be a constant if the experimenter only wanted to test patients that are the same age (for example, 50 year-olds). It all depends on the type of study whether something is a variable or a constant.
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