In a sequential design, if two different cohort groups score alike on a particular measure at the same testing point, the changes in the measured variable can be concluded to be due to

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If two different cohort groups score alike at the same testing point, it suggests that the changes in the measured variable are due to developmental changes, as the similarity in scores indicates that the differences are not due to cohort effects or historical period influences.

In a Sequential Design, If Two Different Cohort Groups Score