context: There is little chance that Sandra got the football. We believe that Lily is white. It is probable that Mary went to the kitchen.
hypothesis: It is certain that either Mary went to the kitchen, or Lily is white.
valid_hypothesis: Chances are about even that either Mary went to the kitchen, or Lily is white.
invalid_hypothesis: It is certain that either Mary went to the kitchen, or Lily is white.
hypothesis_assertion: Either Mary went to the kitchen, or Lily is white.