What is called a group of subjects selected from the all subjects?

A group of subjects selected from all subjects is called a sample.

Here's why:

* Sample: A subset of a population that is chosen for a study. It is used to represent the larger population.

* Population: The entire group of individuals, objects, or events that you are interested in studying.

For example, if you want to study the opinions of all students at a university, the population would be all students. A sample would be a smaller group of students selected from the university to represent the opinions of the entire student body.