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Independent Variable
What the researcher changes/tests
Dependent Variable
What is Measured
Control Group
the baseline for the experiment
Experimental group
receives treatments
Experimental Study
researcher manipulates the variable
Observational Study
Researcher observe without intervening
Correlation
two variables change together; observational studies can show this
Causation
supported only by well-controlled experiments (control group, randomization) that isolate one variable.
Confounding variable
an uncontrolled factor that affects the outcome and can create a misleading link between the variables.