Final answer:
The question inquires about volunteer hours between fraternity brothers and sorority sisters, but available data only provides information on mean grades among sororities, which shows no significant difference.
Step-by-step explanation:
The question of whether fraternity brothers work more volunteer hours on average than sorority sisters falls within the realm of Social Studies, as it deals with the behavior and characteristics of specific social groups within a higher education context. To answer the question posed, one would require statistical data comparing the volunteer hours of fraternity brothers and sorority sisters. However, the available reference information provides an insight into another closely related question about the differences in mean grades among sororities. According to this data, using a significance level of 1 percent, the conclusion is that there is not sufficient evidence to conclude that there is a difference among the mean grades for the sororities. Therefore, there is no direct answer provided regarding volunteer hours based on the given references.
It's important to note that determining the community service involvement of fraternity brothers versus sorority sisters, like in the given survey conducted by State University, would involve collecting and comparing volunteer data directly from both groups. Only with such comparative data can an accurate answer be given.