According to research cited in your textbook, the average American girl between the ages of three and eleven owns __________ Barbie dolls.

Which of the following is the most complex and beneficial way to study change over time?

a cross-sequential design a cross-sectional design a meta-sequential design a longitudinal design

Which of the following children would be considered to be normally developing?

A) 6-year-old Devon, who often spills food when eating B) 4-year-old Camille, who can put on her pants and shirt by herself C) 5-year-old Emma, who can tie her own shoes D) 7-year-old Justin, who writes with a palmar grasp