1-33. (conceptual-19) Which of the following is a major argument AGAINST the use of cross-
sectional research designs in studying adult development?
a. They require too much time to collect data.
b. They typically involve non-representative samples.
*c. They confound age and cohort.
d. They do not allow comparisons of sub-groups, such as middle-class and working-class,
or black and white.
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