Which of the following methods do most researchers use to determine if personality changes in age groups over time?

Question

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Researchers often use mean-level change and rank-order consistency to study if and how personality changes in age groups over time. Mean-level change examines shifts in the average level of a trait within a population over time, while rank-order consistency looks at the relative order of individuals within a population on a particular trait across time.

Which of the Following Methods Do Most Researchers Use to Determine