Human Relationships [Terms]

Cross-sectional design

Compares groups on a variable at a specific time; contrasts with longitudinal studies that track changes over time.

Double-blind testing

Neither researchers nor participants know treatment assignments, preventing bias and placebo effects.

Longitudinal study

Observes participants over time using interviews, testing, or observations; similar to repeated measures design.

Meta-analysis

Combines data from multiple studies on the same question to produce a comprehensive conclusion.

Prospective research

Studies variables early in life and follows participants over time to examine correlations and development.

Single-blind testing

Researchers know treatment assignments, but participants do not, reducing placebo effects but not experimenter bias.