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.
The field has evolved with time. For many years, therapists earned a bachelor's degree prior to becoming licensed. Colleges and universities later transitioned to master's degree programs. If your therapist has the letters MPT or MSPT, this indicates a master's degree in physical therapy. Most programs today now train therapists for a DPT degree, which stands for doctorate of physical therapy. Beyond these basic education credentials, there are a slew of other letter combinations you may find. Many therapists earn specialty certification from the American Board of Physical Therapy Specialities, overseen by the American Physical Therapy Association. About 13,000 therapists in the U.S. have earned this.