Suppose That You Observe 1000 Young Children, Recording the Age

Multiple Choice

Suppose that you observe 1000 young children, recording the age at which each is first able to pick up a rattle and shake it. You now compute an average age at which this developmental milestone is reached by the "typical" child. Your work would be most similar to the work that is summarized in which of the following?

A) the Newborn Behavioral Observation system
B) the Neonatal Behavioral Assessment Scale
C) the Visual Cliff norms
D) the Gesell Scales