Prefrontal lobotomy

Heuristics

Naturalistic observation

External validity

Internal validity

Case study

Existence proofs

Correlational design

Scatterplot

Illusionary correlations

Experiment

Random assignment

Experimental groups

Control group

Independent variable

Dependent variable

Operational definition

Confound

Placebo effect

Blind

Nocebo effect

Experimenter expectancy effect

Double-blind

Demand characteristics

Random selection

Reliability

Validity

Response sets

Informed consent

Statistics

Descriptive statistics

Central tendency

Mean

Median

Mode

Dispersion

Range

Standard deviation

Inferential statistics

Meta-analysis

File drawer problem