A commonly used design in adult development and aging research is the extreme age design (young versus old). Which of the following is a limitation of this type of study?
a. the samples are not representative and may not generalize
b. the measures may not mean the same thing across age groups and may not be valid
c. age is not treated as a continuous variable
d. all of these
Question 2
ou recently read a study in which the researchers concluded that after age 60, women's IQs drop dramatically. This conclusion was based upon comparisons of women born between 1910-1930 and women born between 1960- 1980. Based upon this information,
the comment you would most likely make is
a. this is not a valid result because men were not included in the study.
b. longitudinal research doesn't work well when looking at IQ over time.
c. cohort effects likely account for the observed differences.
d. whoever conducted this study is negatively biased against older women.
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