A selected portion of children from a larger group or population of children that is representative (hopefully) of the larger group is referred to as a

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A selected portion of children from a larger group or population of children that is representative is called a sample. A subset refers to any smaller part of a larger set, and a class is a group of students who are taught together. A cohort refers to a group of people who share a common characteristic or experience, such as being born in the same year or graduating from the same school.

A Selected Portion of Children from a Larger Group or Population