How would you design the study if you were doing an experimental study? Between these two designs which one would be the best method in this case? Why?

DB1

“CORRELATIONAL VS. EXPERIMENTAL DESIGNS”
You have been tasked to research the relationship between academic performance and studying either alone or in a group.
How would you design the study if you were doing a correlational study?
How would you design the study if you were doing an experimental study?
Between these two designs which one would be the best method in this case? Why?

Book if Available: Morling, B. (2021). Research methods in psychology (4th ed.). New York: NY: W.W. Norton & Company, Inc.