Final answer:
Chad is speaking to a performance size audience according to Jim Anderson, which is a large audience suited for a one-to-many interaction, unlike a conversational size audience that enables direct interaction.
Step-by-step explanation:
According to Jim Anderson, Chad will be speaking to a performance size audience when giving a presentation to a huge auditorium of several hundred people. In this context, performance size refers to a type of audience that is large enough where the interaction is one-to-many, similar to a performance, where a single person is addressing the crowd without expectation of a direct conversation with each member of the audience. This is distinctly different from a conversational size audience, which is smaller and allows for interaction between speaker and audience members.