context: Chances are slight that Jeff went to the hallway. There is little chance that Brian is a frog. It is impossible that Lily is a swan.
hypothesis: It is improbable that brian is a frog, or Lily is a swan.
valid_hypothesis: It is improbable that brian is a frog, or Lily is a swan.
invalid_hypothesis: There is a better than even chance that brian is a frog, or Lily is a swan.
hypothesis_assertion: Brian is a frog, or Lily is a swan.