A problem with cross-sectional research is that

cohort differences can make it difficult to differentiate between developmental
change and cohort differences.
retesting leads older subjects to do better.
the most intelligent people are most likely to drop out of the study.
the results tend not to be worth the large investment.

cohort differences can make it difficult to differentiate between developmental
change and cohort differences.

Psychology

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The form of behavioral therapy in which an undesirable behavior is paired with an unpleasant stimulus to reduce the frequency of the behavior is called _______

a) token economy b) operant conditioning c) aversion therapy d) participant modeling

Psychology

Each of Sigmund Freud's psychosexual stages is organized around

a) a latency period. b) an erogenous zone. c) developing abilities for rational thought. d) the development of new psychic structures.

Psychology