Dr. Aslin wants to find out whether there is any relationship between whether or not a child has a sibling and how quickly they learn words. Dr. Aslin needs to decide whether to use a correlational or experimental research design. Which of these two designs involves random assignment? Which research design must Dr. Aslin use for this study? Why must he use that research design? How will using this design affect the conclusions that Dr. Aslin can draw from his study?

Question