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7. Which of the following methods is most helpful for clarifying cause and effect relationships? a correlational research b. the survey c. naturalistic observation d. the experiment
31. When researchers use a design, they typically find that both fluid and crystallized intelligence decline relatively early in life, but when they use a design, they often find that both of these abilities remain stable until much later in life A) correlational; experimental B) cross-sectional; longitudinal C) naturalistic observation, self-report D) placebo; double-blind E) sequential; double-blind
