premise: The City of Manchester Stadium in Manchester, England, also known as the Etihad Stadium for sponsorship reasons, is the home ground of Manchester City Football Club and, with a domestic football capacity of 55,097, the fourth-largest in the Premier League and eighth-largest in the United Kingdom.
hypothesis: The City of Manchester Stadium is the eighth largest in the Premier League. 
reason: I used the stats for the other stadium. The system just saw the information and didn't know it was wrong.