4.5 Key Terms
Scientific method
Data
Replication
Hypothesis
Theory
Predictions
Experiments
Independent variable
Dependent variable
Confounding variables
Control group
Bias
Random assignment
Sampling bias
Population
Sample
Internal validity
External validity
Correlation
Correlation coefficient
Statistically significant
Epidemiology
Longitudinal studies (in studies of psychopathology)
Case studies (in studies of psychopathology)
Single-participant experiments
Meta-analysis
Response bias
Social desirability
Experimenter expectancy effect
Double-blind design
Reactivity
Placebo effect
Attrition
Common factors
Specific factors
Randomized clinical trial (RCT)
Allegiance effect
Dose–response relationship
More Study Aids
For additional study aids related to this chapter, including quizzes to make sure you’ve retained everything you’ve learned and a Student Video Activity exploring how researchers conducted an experiment on the placebo effect, go to: www.worthpublishers.com/launchpad/rkabpsych2e.