context: Two skateboarders, one wearing a black t-shirt and the other wearing a white t-shirt, race each other.
hypothesis: It is improbable that skateboarders race for money.
valid_hypothesis: It is improbable that skateboarders race for money.
invalid_hypothesis: There is a better than even chance that skateboarders race for money.
hypothesis_assertion: Skateboarders race for money.