context: Some people are standing on a city sidewalk at night and waiting to get on a double-decker bus.
hypothesis: It is almost certain that friends wait to get on the bus at night.
valid_hypothesis: Chances are about even that friends wait to get on the bus at night.
invalid_hypothesis: It is almost certain that friends wait to get on the bus at night.
hypothesis_assertion: Friends wait to get on the bus at night.