Many decades ago, psychologists discovered that comparisons of young and old people revealed that cognitive functioning declined in old age when cross-sectional research was used.
The same result did not appear with longitudinal research. The problem here is that the results in the cross-sectional research were affected by
a. cohort effects.
b. baseline effects.
c. wave effects.
d. trend effects.
Question 2
When research involves the simultaneous comparison of two different groups, it is termed
a. multiple baseline research.
b. cross-sectional research.
c. longitudinal research.
d. panel research.
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