In a study by Duyme et al. (1999) of children adopted at a young age into low-, middle-, and high-income families, the key finding was that IQ scores __________.
A. rose equally in all groups due to beneficial effects of adoption
B. rose more in children raised in higher-income groups
C. only rose in the high-income adoptive group
D. declined in the low-income adoptive group
Answer: B
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In single-subject designs, the researcher must:
a. use the .05 probability level. b. use the .001 probability level. c. determine the meaning of the pattern observed. d. randomly assign subjects to groups.
Arrest statistics do not accurately reflect the prevalence of adolescent delinquency because
older criminals lie about their age. many offenders are never caught. more juvenile offenses lead to arrest than do adult crimes. police exaggerate juvenile crimes.
Small-n and single-case research is often considered a variation of _____ design(s)
a. a quasi-experimental b. a within-subject c. a between-subject d. both quasi-experimental AND within-subject
Sometimes it is difficult to generalize the results of a study to the population because of the _____
a. diffusion of treatment problem b. college sophomore problem c. regression to the mean problem d. mortality problem