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.
A Career as a Mental Health Professional. Most states require at least a masterâs degree to work as a counselor or therapist. Psychology-based courses are required plus additional supervised experience in a clinical setting. Almost all states also require a license to practice, requiring the taking of a state exam.