In which community did Rogoff and her colleagues observe parents standing to the side, ready to help the child during exploration, but remaining in the adult role rather than becoming engaged with the child as a peer?

During the mature stage of kicking, a child will

A. hold trunk in an erect position B. exhibit leg action centered mainly at the knee C. hold arms outward for stability D. bend support leg slightly when the ball contacts foot

One advantage to using a longitudinal design over a cross-sectional design is that longitudinal designs:

A) are typically cheaper to perform. B) are less likely to be affected by attrition. C) avoid the problems associated with cohort effects. D) require less time to perform.