A variable is some characteristic of a population or sample.

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A variable is a characteristic or attribute that can be measured or observed in a population or sample. Examples of variables include age, gender, height, weight, income, and education level. Variables can be quantitative (measured on a numerical scale) or qualitative (categorical or nominal in nature). Understanding and analyzing variables is foundational to many fields, including statistics, social science, marketing, and healthcare.

A Variable Is Some Characteristic of a Population or Sample