Examlex
Only by studying identical twins raised in separate environments can scientists uncover the role of genes vs. environment in the development of a specific trait. Comparing the occurrence of the trait in identical vs. fraternal twins yields little usable data.
Cross-Sectional Research
A research method that involves analyzing data from a population, or a representative subset, at a specific point in time.
Theory
A well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed through observation and experimentation.
Reliability
The degree to which an assessment tool produces stable and consistent results.
Validity
The extent to which a test, experiment, or measurement accurately reflects what it is intended to measure.
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