Which one of these article titles implies that the study involved an experiment?

Question

Quizplus · Accepted Answer

The title "The effects of family counseling on reductions in child aggression" implies that there was an intervention (family counseling) to test the effects on a specific outcome (reductions in child aggression), which is indicative of an experiment. The other titles describe studies that may have used observational or correlational methods.

Which One of These Article Titles Implies That the Study