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.
Essential Information. Students interested in becoming physical therapists usually begin by enrolling in undergraduate degree programs with emphases in health or science-related fields. In order to practice, students must then complete accredited physical therapy graduate degree programs. Physical therapists must be certified in order to legally practice. 1  Program Levels in Physical Therapy: Master of Physical Therapy (MPT), Doctor of Physical Therapy (DPT).