Table: gulf coast athletic conference
Question: Is there a difference in the enrollment size of institutions that joined in 2010 versus in 2011 in the Gulf Coast Athletic Conference? Answer with only 'Yes' or 'No' that is most accurate and nothing else.
Step 1 (Operation, Filter): joined
Step 2 (Reasoning, Aggregating): AVG, enrollment in 2010
Step 3 (Reasoning, Aggregating): AVG, enrollment in 2011
Step 4 (Reasoning, Other Commonsense Reasoning): Is there a difference
Answer: Yes