premise: Joseph Edward Lauzon Jr. (born May 22, 1984) is an American mixed martial artist competing in the UFC's Lightweight division. He is tied with Nate Diaz as having the most post-fight bonus awards in UFC history. Joe's younger brother, Dan Lauzon, is also a mixed martial artist.
hypothesis: Nate Diaz is an american mixed martial artist
reason: We know Joe Lauzon is a mixed martial artist. We don't know where Nate Diaz is from therefore neither definitely correct nor definitely incorrect.