Dr Yin Studies the Onset and Development of Locomotion Using

Multiple Choice

Dr Yin studies the onset and development of locomotion using parent diaries. In her data, she discovers a wide spread of ages for locomotion onset, ranging from 10 months to 18 months, with most children starting to walk at 14 months of age. What does this suggest about development of locomotion?

A) Development of locomotion is distributed in a statistically normal fashion.
B) Individual differences exist in the development of locomotion.
C) Parents are poor sources of information about children's development of locomotion.
D) Both a and b.
E) Both b and c.