context: A young man in jogging slacks is checking information on his mobile devise while listening to something on a crowded commuter rail car.
hypothesis: It is probably not the case that the young man has an Apple mobile device.
valid_hypothesis: It is probably not the case that the young man has an Apple mobile device.
invalid_hypothesis: It is likely that the young man has an Apple mobile device.
hypothesis_assertion: The young man has an Apple mobile device.