Researchers tracked 2668 people from early childhood through adulthood and found that 13-year-olds who are frequent
targets of bullies were three times more likely than their non-victimized peers to be depressed later as adults.
Identify the population, sample, and variables for the study. Not all statements will be used.

How to find populations and sample and variables

Researchers tracked 2668 people from early childhood through adulthood and found that 13yearolds who are frequent targets of bullies were three times more likel class=