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Dr. Bloedorn is a health psychologist who researches nutrition. She is curious as to whether a new drink additive will help people consume fewer calories during a meal. The drink additive is a white, odorless, tasteless powder that a person can add to any drink. She collects a random sample of 63 overweight students on campus and measures the calories they eat during lunch using a bomb calorimeter. She then gives this additive to the same 63 participants to use at dinner and measures how many calories they eat (again using the bomb calorimeter) .
Which of the following threats to internal validity will Dr. Bloedorn NOT be worried about?
Automobile Driving
The operation and control of a car, including the mastery of various techniques and understanding of road rules for safe transportation.
Marginal Cost
The additional cost incurred from producing one more unit of a good or service.
Moral Hazard
The situation where one party in an agreement is tempted to take undue risks because the negative consequences of the risk will be suffered by the other party.
Efficient Level
The optimal point of production or operation where costs are minimized and productivity or utility is maximized.
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