Random samples are used in population sampling situations when reviewing historical or batch data. The key to random sampling is that each unit in the population has an equal probability of being selected in the sample.
Individuals pursuing a career as an occupational therapist usually need to earn a post-baccalaureate degree from an accredited college or university or education deemed equivalent.  Education and training. A master's degree or higher in occupational therapy is the minimum requirement for entry into the field.
Future child therapists, for example, might choose to study child or developmental psychology. You will, at minimum, need a master's degree to become a therapist, though some therapists pursue doctoral-level degrees.. Complete high school or obtain a GED and go to college. In college, major in a subject related to mental health and therapy, such as psychology, child development, social work, or neuroscience.