Question

Dr. Booker is researching friendship patterns across childhood. She has included four groups in her study: 4-year-olds, 6-year-olds, 8-year-olds, and 10-year-olds. This is an example of

Answer 1

Dr. Booker's action of including different groups in her study/research is called Sampling.

What is sampling?

This refers to the practice of selecting members of a subset of the population under study in order to draw statistical inferences from them to acquire approximate characteristics of the whole population.

See the link below for more about Sampling:
https://brainly.com/question/9910540