What is the structure of X,product of the following reaction? 
Definitions:
Internal Validity
The extent to which a research study can demonstrate a causal relationship between variables, free from confounding factors.
Generalizability
The extent to which findings from a study or research can be applied to broader populations or different contexts beyond the original conditions of the study.
Sampling Methods
Techniques used to select samples from a population for the purpose of conducting research and obtaining data.
Aggregation
In psychology, a method involving the combination of multiple measurements or observations over time to obtain a more reliable estimate of a trait or behavior.
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