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.
Students must complete a four-year bachelorâs degree to enter a doctor of physical therapy program. While completing the undergraduate degree, they may have to take required prerequisite courses, such as biology, chemistry, physics, social science and statistics, to gain admittance to the graduate program. residency program may take up to a year to complete and allow the therapist to focus on a specific area in the field. For example, the Hospital for Special Surgery offers a hand therapy fellowship that requires a nine-month commitment to complete.