Methods and stats basics.
Hypothesis
Testable prediction.
Operational definition
How a variable is measured.
Independent variable
Manipulated by researcher.
Dependent variable
Measured outcome.
Confounding variable
Extra variable that muddies results.
Random assignment
Equal chance to experimental conditions.
Random sample
Equal chance to be selected from population.
Correlation
Relationship between variables; not causation.
Experiment
Can support causal claims with control.
Case study
In-depth study of one/few subjects.
Survey
Self-report questionnaire/interview.
Naturalistic observation
Watch behavior in real settings.
Placebo
Inactive treatment control.
Double-blind
Neither subjects nor experimenters know conditions.