Which variables describe characteristics of the study participants such as gender and years of service that cannot be manipulated

Demographics.

Explanation:

The variables which describe the characteristics of the study participants such as gender and years of service that cannot be manipulated is known as demographics.

Demographics can be defined as the study and analysis of the characteristics of a population based on pre-defined factors such as education, race, income, sex or gender, and age.

For example, businesses gather, analyze and use demographic informations about people in the target market so as to have a competitive edge or advantage and to help build a strong relationship.

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