Final answer:
Graphs are a powerful tool in social studies and other subjects as they condense numerical data and provide an intuitive sense of relationships in the data.
Step-by-step explanation:
When Dave struggled to make sense of all the data in his study of motorcycle gangs, he decided to put all his concepts into a graphical format. This visual representation of data allowed him to think more clearly about the relationships among his concepts. Graphs are a powerful tool in social studies and other subjects as they condense numerical data and provide an intuitive sense of relationships in the data.