context: Three women and two men are standing at the foot of a large staircase holding stringed instruments and a clarinet.
hypothesis: There is a better than even chance that they are about to go upstairs.
valid_hypothesis: There is a better than even chance that they are about to go upstairs.
invalid_hypothesis: There is almost no chance that they are about to go upstairs.
hypothesis_assertion: They are about to go upstairs.