Examlex
_____ is key to minimizing systematic differences between conditions before a study even begins.
U.S. Population
The total number of people living in the United States, a dynamic figure that reflects the country's growth and demographic changes.
Population Density
A measurement of the number of people living in a given area, often expressed as individuals per unit of land area.
Demographic Characteristics
The study and classification of people based on attributes such as age, gender, income level, and education, which helps in market segmentation.
Density
A measurement of mass per unit volume of a substance, often used in scientific and engineering contexts to describe the compactness of a material.
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