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16. A hypothesis is an) a unprovable assumption about the unobservable processes that underlie psychological functioning. b. set of principles that organizes observations and explains newly discovered facts, c. testable prediction that gives direction to research. d. observable relationship between specific independent and dependent variables.
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