In a recent lecture, Professor Lane argued that increased funding for public libraries leads to greater community engagement. She pointed out that cities which allocate a higher percentage of their budget to public libraries report higher attendance at library events and more community programs being offered. Further, she mentioned a specific case in Maplewood, where a 15% increase in library funding resulted in a doubling of event attendance within one year. However, critics of her argument contend that increasing library funding alone does not guarantee higher community engagement, as other factors like population density and economic conditions may also play significant roles.
To strengthen Professor Lane's argument, which of the following would be most helpful?