Final answer:
Stan is part of a secondary group, which is larger, impersonal, and focused on goal-oriented functions. Interaction within this type of group is usually infrequent and the ties are relatively weak.
Step-by-step explanation:
The type of group that Stan is part of, given that it's a large, impersonal group where interaction is infrequent and ties are relatively weak, would be considered a secondary group. A secondary group is typically larger and less intimate than primary groups, often organized around a specific task or activity, like the collegiate chapter of the American Marketing Association. These groups play an instrumental role in society, serving task-based and goal-oriented functions.