Researchers at one point in time assess and compare the performance of different age groups on the sat. the procedure used in this research best illustrates
a. a cross-sectional study.
b. a cohort study.
c. a longitudinal study.
d. the flynn effect.

A cross-sectional study

Explanation:

A cross-sectional study is an observational study type. In this study the researcher conduct study at a specific point of time. This study analyses the data that is collected from a population or a subset of the population sample.

It is also called a cross-sectional analysis or prevalence study or it is also called a transverse study. In this study, all variables are the same except one variable in the study. But this variable will be constant throughout the study.  

This study can be conducted with a different organization. Thus in the above statement, the researcher used cross-sectional research in his study.  

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