Piaget has provided us with the ______ context of children's concepts, whereas Vygotsky has provided us with the ______ context

A correlation coefficient represents two things: _____ and _____

a) a sample; strength. b) the strength; direction of the relationship. c) the direction; a cause. d) the relationship; expectant functionality.

Eisenberg et al. (1999) studied a single group of 32 children, taking measurements of their helping behaviors approximately every two years from the time the children were four years old until they were young adults. This study used a(n)

A) hybrid design. B) longitudinal design. C) cross-sectional design. D) experimental design.