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.
Education. Get the education you need: Find schools for Physical Therapists near you! In 2013, there were 218 programs for physical therapists accredited by the Commission on Accreditation in Physical Therapy Education, all of which offered a Doctor of Physical Therapy (DPT) degree. DPT programs typically last 3 years. Most programs require a bachelor's degree for admission as well as specific prerequisites, such as anatomy, physiology, biology, chemistry, and physics. Most DPT programs require applicants to apply through the Physical Therapist Centralized Application Service (PTCAS).