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Cliff Administers His "Closeness with Family" Questionnaire to a Sample

Question 90

Multiple Choice

Cliff administers his "Closeness with Family" questionnaire to a sample of children when they are 9 years old and then again when they turn 15. Cliff has done ________ research.


A) longitudinal
B) cross-sectional
C) single-strata
D) case study

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