Examlex
Name the four types of validity that are important in experimental research.
Undisclosed Principal
A principal whose existence is not known by a third party. That is, the third party does not know that an agent is acting on behalf of a principal.
Agent
An individual or entity authorized to act on behalf of another (known as the principal) in dealings with third parties, creating a legal relationship called agency.
Authority
The power or right to give orders, make decisions, and enforce obedience, or a person or organization having such power.
Contract
A legal agreement between two or more parties that creates mutual obligations enforceable by law.
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