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What attachment type was highly predictive of later problems and included toddlers who in early and middle childhood exhibited hostility and aggression?
Internal Validity
The extent to which a study accurately demonstrates a cause-effect relationship by controlling for extraneous variables and bias.
Control Group
In an experiment, the group that does not receive the treatment or intervention being tested, serving as a benchmark for comparison.
Expectancy Effects
Phenomena in which the outcome of a study is influenced by the participants' or experimenters' expectations.
Demand Characteristics
Cues that inform the subject how he or she is expected to behave.
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