Section II: Select 2 questions (Minimum single spaced 1/2 page). 3. Explain types of longitudinal designs (trend, cohort, and panel study) by using examples. (10 points) 4. Explain types of single subject designs (SSD) (e.g., AB, ABA, ABAB, ABC, \& Multiple baseline designs) by using examples and advantages/disadvantages of SSD. (10 points) 5. Explain random sampling (simple, systematic, \& stratified) and non-random sampling (convenience, purposive, \& snowball) by using examples. Discuss advantages and disadvantages of both sampling procedures. (10 points) 6. Discuss the difference between random sampling and random assignment by using examples. (10 points)..