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.
5. Earn a graduate degree. This is the minimum level of educational required to practice as a therapist in most private, governmental and organizational practices. While the bachelor's degree studies the general topics of psychology, a graduate degree focuses on practice, research and independent study.