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Doris Denning wanted to study the relationship between high school students' grades and assessments of their teachers.After teaching her research assistants proper interviewing techniques,Doris provided them with fake transcripts and disciplinary histories,which depicted some students as exceptional and others as trouble-makers.In reality,the 'exceptional' students and 'trouble-makers' were labelled as such randomly.Once the assistants' interviews concluded,the data indicated 'exceptional' students held their teachers in much higher esteem than the 'trouble-makers.' What threat to internal validity does Doris' study most likely have?
Torque
The rotational or twisting force applied to an object; crucial in determining an engine's power.
Inertia
A physical principle stating that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Momentum
The quantity of motion of a moving body, measured as a product of its mass and velocity.
Horsepower
A rating of the amount of work performed by an engine. Originally based on the amount of weight a horse could move in one minute. One HP is equal to about 746 watts.