context: It is highly unlikely that Bill left the apple. It is unlikely that Sandra took the football. Chances are slight that Julius is a swan.
hypothesis: It is probable that either Julius is a swan, or Bill left the apple.
valid_hypothesis: It is improbable that either Julius is a swan, or Bill left the apple.
invalid_hypothesis: It is probable that either Julius is a swan, or Bill left the apple.
hypothesis_assertion: Either Julius is a swan, or Bill left the apple.