context: An older man sitting on a stool on the sidewalk playing a violin.
hypothesis: There is almost no chance that an old man plays his violin for tips on the sidewalk.
valid_hypothesis: Chances are about even that an old man plays his violin for tips on the sidewalk.
invalid_hypothesis: There is almost no chance that an old man plays his violin for tips on the sidewalk.
hypothesis_assertion: An old man plays his violin for tips on the sidewalk.