Frank and his baby daughter participate in a research study in which they go to a room where they are met by a researcher. Then Frank is asked to leave the room and the researcher observes how his daughter reacts. This study is most similar to the one described as:

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The text describes the strange situation studies conducted by Mary Ainsworth, which involve the same methodology as that described in this question. Baby biographies are records of when and how babies achieve developmental milestones. The term "bioecological interview" has no particular meaning but is simply two words from the chapter combined. A sequential-cohort study involves the study of several overlapping cohorts of different ages at various points in time.

Frank and His Baby Daughter Participate in a Research Study