A small consulting firm, "TechConsult," wants to assess employee satisfaction to improve workplace culture. The firm has 200 employees across its five office locations. To collect feedback, the HR department sends a survey to employees in only one of the five office locations, which has 40 employees. Out of the 40 employees, 25 responded to the study. The firm finds that the average satisfaction score is 7.5 and concludes that overall employee satisfaction is moderate. Determine which elements of the study are a potential problem