context: Very large group of old people riding in boats down a river.
hypothesis: We believe that a geriatric group of student canoeists follow their instructor.
valid_hypothesis: It is improbable that a geriatric group of student canoeists follow their instructor.
invalid_hypothesis: We believe that a geriatric group of student canoeists follow their instructor.
hypothesis_assertion: A geriatric group of student canoeists follow their instructor.