Answer:
reactivity
Explanation:
According to my research on different experimental methodology, I can say that based on the information provided within the question Joaquin may have had some problems because of reactivity. Bringing bright lights and wearing yellow jump suits is not a normal scenery inside a McDonald's therefore it most likely caused many people and employees to be alarmed or shocked causing them to act differently than they normally would. This would ruin Joaquin's desire to do a naturalistic observation.
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