Examlex
One reason a valid experiment may produce null results is:
Social Facilitation
An improvement in the performance of well-learnt/easy tasks and a deterioration in the performance of poorly learnt/difficult tasks in the mere presence of members of the same species.
Free-rider Effect
A phenomenon where individuals benefit from resources or services without contributing to the cost, common in public goods scenarios.
Public Goods Dilemma
A situation in economics where individuals must decide whether to contribute to a public good that benefits all, even if contributing comes at a personal cost, leading to challenges in provisioning and maintaining public goods.
Sherif's Summer Camps
A series of social psychology experiments conducted by Muzafer Sherif, demonstrating how intergroup conflict and cooperation can be influenced by group goals and challenges.
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