context: It is almost certain that Winona is a cat. It is improbable that Mary left the football. It is unlikely that John went to the garden.
hypothesis: We believe that winona is a cat, and Mary left the football.
valid_hypothesis: Chances are slight that winona is a cat, and Mary left the football.
invalid_hypothesis: We believe that winona is a cat, and Mary left the football.
hypothesis_assertion: Winona is a cat, and Mary left the football.