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Supertype/Subtype relationships should be used when the instances of a subtype participate in no relationships which are unique to that subtype.
Confounding Variables
Variables that the researcher failed to control or eliminate, which can cause a false association between the studied variables.
Control Group
Group of participants in an experiment not exposed to the independent variable.
Survey Research
Research methods obtaining information directly from a group of people regarding their opinions, beliefs, or behavior.
Non-experimental Research
Observational research in which the researcher does not actively manipulate variables but observes natural occurrences.
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