context: Seven men are preparing to operate a helicopter
hypothesis: It is highly likely that two instructors are teaching a small class of five how to fly a helicopter.
valid_hypothesis: There is little chance that two instructors are teaching a small class of five how to fly a helicopter.
invalid_hypothesis: It is highly likely that two instructors are teaching a small class of five how to fly a helicopter.
hypothesis_assertion: Two instructors are teaching a small class of five how to fly a helicopter.